diff --git a/Makefile.am b/Makefile.am
index 6a8ed1b..8cffeff 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -25,8 +25,8 @@ libcwSRC +=                           src/libcw/cwSpScBuf.cpp src/libcw/cwSpScQu
 libcwHDR += src/libcw/cwAudioFile.h     src/libcw/cwMidiFile.h
 libcwSRC += src/libcw/cwAudioFile.cpp   src/libcw/cwMidiFile.cpp
 
-libcwHDR += src/libcw/cwAudioFileOps.h    src/libcw/cwAudioTransforms.h   src/libcw/cwAudioFileProc.h    src/libcw/cwPvAudioFileProc.h
-libcwSRC += src/libcw/cwAudioFileOps.cpp  src/libcw/cwAudioTransforms.cpp src/libcw/cwAudioFileProc.cpp  src/libcw/cwPvAudioFileProc.cpp
+libcwHDR += src/libcw/cwAudioFileOps.h    src/libcw/cwAudioTransforms.h   src/libcw/cwDspTransforms.h   src/libcw/cwAudioFileProc.h    src/libcw/cwPvAudioFileProc.h
+libcwSRC += src/libcw/cwAudioFileOps.cpp  src/libcw/cwAudioTransforms.cpp src/libcw/cwDspTransforms.cpp src/libcw/cwAudioFileProc.cpp  src/libcw/cwPvAudioFileProc.cpp
 
 libcwHDR += src/libcw/cwFlow.h    src/libcw/cwFlowTypes.h     src/libcw/cwFlowProc.h
 libcwSRC += src/libcw/cwFlow.cpp  src/libcw/cwFlowTypes.cpp   src/libcw/cwFlowProc.cpp
diff --git a/cwDspTransforms.cpp b/cwDspTransforms.cpp
new file mode 100644
index 0000000..f444658
--- /dev/null
+++ b/cwDspTransforms.cpp
@@ -0,0 +1,163 @@
+#include "cwCommon.h"
+#include "cwLog.h"
+#include "cwCommonImpl.h"
+#include "cwMem.h"
+#include "cwFile.h"
+#include "cwText.h"
+#include "cwObject.h"
+#include "cwAudioFile.h"
+#include "cwUtility.h"
+#include "cwFileSys.h"
+#include "cwAudioFileOps.h"
+#include "cwVectOps.h"
+#include "cwMath.h"
+#include "cwDspTypes.h"
+#include "cwDsp.h"
+#include "cwDspTransforms.h"
+
+namespace cw
+{
+  namespace dsp
+  {
+    namespace compressor
+    {
+      void _ms_to_samples( obj_t*p, real_t ms, unsigned& outRef )
+      {
+        outRef = std::max((real_t)1,(real_t)floor(ms * p->srate / 1000.0));
+      }
+    }
+  }
+}
+
+cw::rc_t cw::dsp::compressor::create( obj_t*& p, real_t srate, unsigned procSmpCnt, real_t inGain, real_t rmsWndMaxMs, real_t rmsWndMs, real_t threshDb, real_t ratio_num, real_t atkMs, real_t rlsMs, real_t outGain, bool bypassFl )
+{
+  p = mem::allocZ<obj_t>();
+      
+  p->srate      = srate;
+  p->procSmpCnt = procSmpCnt;
+  p->threshDb   = threshDb;
+  p->ratio_num  = ratio_num;
+
+  set_attack_ms(p,atkMs);
+  set_release_ms(p,rlsMs);
+
+  p->inGain     = inGain;
+  p->outGain    = outGain;
+  p->bypassFl   = bypassFl;
+
+  p->rmsWndAllocCnt = (unsigned)std::max(1.0,floor(rmsWndMaxMs * srate / (1000.0 * procSmpCnt)));
+  p->rmsWnd         = mem::allocZ<sample_t>(p->rmsWndAllocCnt);
+  set_rms_wnd_ms(p, rmsWndMs );
+  p->rmsWndIdx = 0; 
+
+  p->state       = kRlsCompId;
+  p->timeConstDb = 10.0;
+  p->accumDb     = p->threshDb;
+
+  return kOkRC;
+}
+    
+cw::rc_t cw::dsp::compressor::destroy( obj_t*& p )
+{
+  mem::release(p->rmsWnd);
+  mem::release(p);
+  return kOkRC;
+}
+
+/*
+  The ratio determines to what degree a signal above the threshold is reduced.
+  Given a 2:1 ratio, a signal 2dB above the threshold will be reduced to 1db above the threshold.
+  Given a 4:1 ratio, a signal 2dB above the threshold will be reduced to 0.25db above the threshold.
+  Gain_reduction_db = (thresh - signal) / ratio_numerator  (difference between the threshold and signal level after reduction)
+  Gain Coeff = 10^(gain_reduction_db / 20);
+ 
+  Total_reduction_db = signal - threshold + Gain_reduc_db
+  (total change in signal level)
+
+  The attack can be viewed as beginning at the threshold and moving to the peak
+  over some period of time. In linear terms this will go from 1.0 to the max gain
+  reductions. In this case we step from thresh to peak at a fixed rate in dB
+  based on the attack time.
+
+  Db:        thresh - [thesh:peak] / ratio_num
+  Linear: pow(10, (thresh - [thesh:peak] / ratio_num)/20 );
+
+  During attacks p->accumDb increments toward the p->pkDb.
+  During release p->accumDb decrements toward the threshold.
+  
+  (thresh - accumDb) / ratio_num gives the signal level which will be achieved
+  if this value is converted to linear form and applied as a gain coeff.
+
+  See compressor.m
+*/
+    
+cw::rc_t cw::dsp::compressor::exec( obj_t* p, const sample_t* x, sample_t* y, unsigned n )
+{
+
+  sample_t xx[n];
+
+  vop::mul(xx,x,p->inGain,n); // apply input gain
+
+  p->rmsWnd[ p->rmsWndIdx ] = vop::rms(xx, n);               // calc and store signal RMS
+  p->rmsWndIdx              = (p->rmsWndIdx + 1) % p->rmsWndCnt; // advance the RMS storage buffer
+
+  real_t rmsLin = vop::mean(p->rmsWnd,p->rmsWndCnt);                   // calc avg RMS
+  real_t rmsDb  = std::max(-100.0,20 * log10(std::max((real_t)0.00001,rmsLin)));  // convert avg RMS to dB
+  rmsDb += 100.0;
+
+  // if the compressor is bypassed
+  if( p->bypassFl )
+  {
+    vop::copy(y,x,n); // copy through - with no input gain
+    return kOkRC;
+  }
+
+  // if the signal is above the threshold
+  if( rmsDb <= p->threshDb )
+    p->state = kRlsCompId;
+  else
+  {
+    if( rmsDb > p->pkDb )  
+      p->pkDb   = rmsDb;
+    
+    p->state  = kAtkCompId;    
+  }
+
+  switch( p->state )
+  {
+    case kAtkCompId:                      
+      p->accumDb = std::min(p->pkDb, p->accumDb + p->timeConstDb * n / p->atkSmp );
+      break;
+
+    case kRlsCompId:
+      p->accumDb = std::max(p->threshDb, p->accumDb - p->timeConstDb * n / p->rlsSmp );
+      break;
+  }
+
+  p->gain = pow(10.0,(p->threshDb - p->accumDb) / (p->ratio_num * 20.0));
+
+  vop::mul(y,xx,p->gain * p->outGain,n);
+  
+  return kOkRC;
+      
+}
+
+    
+void cw::dsp::compressor::set_attack_ms(  obj_t* p, real_t ms )
+{
+  _ms_to_samples(p,ms,p->atkSmp);
+}
+    
+void cw::dsp::compressor::set_release_ms( obj_t* p, real_t ms )
+{
+  _ms_to_samples(p,ms,p->rlsSmp);
+}
+    
+void cw::dsp::compressor::set_rms_wnd_ms( obj_t* p, real_t ms )
+{
+  p->rmsWndCnt = std::max((unsigned)1,(unsigned)floor(ms * p->srate / (1000.0 * p->procSmpCnt)));
+
+  // do not allow rmsWndCnt to exceed rmsWndAllocCnt
+  if( p->rmsWndCnt > p->rmsWndAllocCnt )
+    p->rmsWndCnt = p->rmsWndAllocCnt;      
+}
diff --git a/cwDspTransforms.h b/cwDspTransforms.h
new file mode 100644
index 0000000..7ef92c9
--- /dev/null
+++ b/cwDspTransforms.h
@@ -0,0 +1,53 @@
+#ifndef cwDspTransforms_h
+#define cwDspTransforms_h
+
+namespace cw
+{
+  namespace dsp
+  {
+    //---------------------------------------------------------------------------------------------------------------------------------
+    // compressor
+    //
+    namespace compressor
+    {
+      enum { kAtkCompId, kRlsCompId };
+
+      typedef struct
+      {
+        real_t      srate;          // system sample rate
+        unsigned    procSmpCnt;     // samples per exec cycle
+        real_t      inGain;         // input gain
+        real_t      threshDb;       // threshold in dB (max:100 min:0) 
+        real_t      ratio_num;      // numerator of the ratio
+        unsigned    atkSmp;         // time to reduce   the signal by 10.0 db
+        unsigned    rlsSmp;         // time to increase the signal by 10.0 db
+        real_t      outGain;        // makeup gain
+        bool        bypassFl;       // bypass enable
+        sample_t*   rmsWnd;         // rmsWnd[rmsWndAllocCnt]
+        unsigned    rmsWndAllocCnt; // 
+        unsigned    rmsWndCnt;      // current RMS window size (rmsWndCnt must be <= rmsWndAllocCnt)
+        unsigned    rmsWndIdx;      // next RMS window input index
+        unsigned    state;          // env. state
+        real_t      rmsDb;          // current incoming signal RMS (max:100 min:0)
+        real_t      gain;           // current compressor  gain
+        real_t      timeConstDb;    // the atk/rls will incr/decr by 'timeConstDb' per atkMs/rlsMs.
+        real_t      pkDb;           //
+        real_t      accumDb;        //
+
+      } obj_t;
+      
+      rc_t create( obj_t*& p, real_t srate, unsigned procSmpCnt, real_t inGain, real_t rmsWndMaxMs, real_t rmsWndMs, real_t threshDb, real_t ratio, real_t atkMs, real_t rlsMs, real_t outGain, bool bypassFl );
+      rc_t destroy( obj_t*& pp );
+      rc_t exec( obj_t* p, const sample_t* x, sample_t* y, unsigned n );
+      
+      void set_attack_ms(  obj_t* p, real_t ms );
+      void set_release_ms( obj_t* p, real_t ms );
+      void set_thresh_db(  obj_t* p, real_t thresh );
+      void set_rms_wnd_ms( obj_t* p, real_t ms );
+    }
+    
+  }
+  
+}
+
+#endif
diff --git a/cwDspTypes.h b/cwDspTypes.h
new file mode 100644
index 0000000..adcc433
--- /dev/null
+++ b/cwDspTypes.h
@@ -0,0 +1,13 @@
+#ifndef cwDspTypes_h
+#define cwDspTypes_h
+
+namespace cw
+{
+  namespace dsp
+  {
+    typedef float    real_t;
+    typedef real_t   sample_t;
+    typedef real_t   srate_t;
+  }
+}
+#endif
diff --git a/cwFlow.cpp b/cwFlow.cpp
index 4799b45..fceedac 100644
--- a/cwFlow.cpp
+++ b/cwFlow.cpp
@@ -7,6 +7,7 @@
 #include "cwAudioFile.h"
 #include "cwVectOps.h"
 #include "cwMtx.h"
+#include "cwDspTypes.h" // real_t, sample_t
 #include "cwFlow.h"
 #include "cwFlowTypes.h"
 #include "cwFlowProc.h"
@@ -27,6 +28,7 @@ namespace cw
       { "pv_analysis",  &pv_analysis::members },
       { "pv_synthesis", &pv_synthesis::members },
       { "spec_dist",    &spec_dist::members },
+      { "compressor",   &compressor::members },
       { nullptr, nullptr }
     };
 
@@ -102,7 +104,7 @@ namespace cw
           }
         }
         
-        // parse the value dictionary
+        // parse the variable dictionary
         if( varD != nullptr )
         {
           if( !varD->is_dict() )
@@ -124,7 +126,7 @@ namespace cw
             const object_t* var_obj   = varD->child_ele(j);
             const char*     type_str  = nullptr;
             unsigned        type_flag = 0;
-            bool            srcVarFl  = false;            
+            bool            srcVarFl  = false;
             var_desc_t*     vd        = mem::allocZ<var_desc_t>();
 
             vd->label = var_obj->pair_label();
@@ -146,7 +148,7 @@ namespace cw
             }
 
             // get the variable description 
-            if((rc = var_obj->getv_opt("srcFl", srcVarFl)) != kOkRC )
+            if((rc = var_obj->getv_opt("srcFl", srcVarFl,"value",vd->val_cfg)) != kOkRC )
             {
               rc = cwLogError(rc,"Parsing optional fields failed on class:%s variable: '%s'.", cd->label, vd->label );
               goto errLabel;
@@ -206,14 +208,14 @@ namespace cw
       }
 
       // locate source value
-      if((rc = var_get( src_inst, suffix, kAnyChIdx, src_var)) != kOkRC )
+      if((rc = var_find( src_inst, suffix, kAnyChIdx, src_var)) != kOkRC )
       {
         rc = cwLogError(rc,"The source var '%s' was not found on the source instance '%s'.", cwStringNullGuard(suffix), cwStringNullGuard(sbuf));
         goto errLabel;
       }
 
       // locate input value
-      if((rc = var_get( in_inst, in_var_label, kAnyChIdx, in_var )) != kOkRC )
+      if((rc = var_find( in_inst, in_var_label, kAnyChIdx, in_var )) != kOkRC )
       {
         rc = cwLogError(rc,"The input value '%s' was not found on the instance '%s'.", cwStringNullGuard(in_var_label), cwStringNullGuard(in_inst->label));
         goto errLabel;        
@@ -244,6 +246,9 @@ namespace cw
 
     void _destroy_inst( instance_t* inst )
     {
+      if( inst == nullptr )
+        return;
+      
       if( inst->class_desc->members->destroy != nullptr && inst->userPtr != nullptr )
         inst->class_desc->members->destroy( inst );
 
@@ -252,7 +257,7 @@ namespace cw
       variable_t* var1 = nullptr;      
       while( var0 != nullptr )
       {
-        var1 = var0->link;
+        var1 = var0->var_link;
         _var_destroy(var0);
         var0 = var1;
       }
@@ -262,27 +267,28 @@ namespace cw
       mem::release(inst);
     }
 
+    rc_t  _var_map_id_to_index(  instance_t* inst, unsigned vid, unsigned chIdx, unsigned& idxRef );
+
     rc_t _create_instance_var_map( instance_t* inst )
     {
-      rc_t rc = kOkRC;
-      unsigned max_vid = kInvalidId;
-      unsigned max_chIdx = 0;
-
+      rc_t        rc        = kOkRC;
+      unsigned    max_vid   = kInvalidId;
+      unsigned    max_chIdx = 0;
+      variable_t* var       = inst->varL;
+      //variable_t* v0        = nullptr;
+      
       // determine the max variable vid and max channel index value among all variables
-      for(variable_t* var=inst->varL; var!=nullptr; var=var->link)
+      for(; var!=nullptr; var = var->var_link )
       {
-        
-        if( var->vid == kInvalidId )
+        if( var->vid != kInvalidId )
         {
-          rc = cwLogError(kInvalidStateRC,"The variable '%s' on instance '%s' was not assigned an id.",var->label,inst->label);
-          goto errLabel;
-        }
-        
-        if( max_vid == kInvalidId || var->vid > max_vid )
-          max_vid = var->vid;
+          if( max_vid == kInvalidId || var->vid > max_vid )
+            max_vid = var->vid;
 
-        if( var->chIdx != kAnyChIdx && var->chIdx > max_chIdx )
-          max_chIdx = var->chIdx;
+          if( var->chIdx != kAnyChIdx && var->chIdx > max_chIdx )
+            max_chIdx = var->chIdx;
+
+        }
       }
 
       // If there are any variables
@@ -295,26 +301,27 @@ namespace cw
         inst->varMapA   = mem::allocZ<variable_t*>( inst->varMapN );
 
         // assign each variable to a location in the map
-        for(variable_t* var=inst->varL; var!=nullptr; var=var->link)
-        {
-          unsigned idx = kInvalidIdx;
+        for(variable_t* var=inst->varL; var!=nullptr; var=var->var_link)
+          if( var->vid != kInvalidId )
+          {
+            unsigned idx = kInvalidIdx;
 
-          if((rc = var_map_id_to_index( inst, var->vid, var->chIdx, idx )) != kOkRC )
-            goto errLabel;
+            if((rc = _var_map_id_to_index( inst, var->vid, var->chIdx, idx )) != kOkRC )
+              goto errLabel;
 
           
-          // verify that there are not multiple variables per map position          
-          if( inst->varMapA[ idx ] != nullptr )
-          {
-            variable_t* v0 = inst->varMapA[idx];
-            rc = cwLogError(kInvalidStateRC,"The variable '%s' id:%i ch:%i and '%s' id:%i ch:%i share the same variable map position on instance: %s. This is usually cased by duplicate variable id's.",
-                            v0->label,v0->vid,v0->chIdx, var->label,var->vid,var->chIdx,inst->label);
-            goto errLabel;
-          }
+            // verify that there are not multiple variables per map position          
+            if( inst->varMapA[ idx ] != nullptr )
+            {
+              variable_t* v0 = inst->varMapA[idx];
+              rc = cwLogError(kInvalidStateRC,"The variable '%s' id:%i ch:%i and '%s' id:%i ch:%i share the same variable map position on instance: %s. This is usually cased by duplicate variable id's.",
+                              v0->label,v0->vid,v0->chIdx, var->label,var->vid,var->chIdx,inst->label);
+              goto errLabel;
+            }
 
-          // assign this variable to a map position
-          inst->varMapA[ idx ] = var;
-        }
+            // assign this variable to a map position
+            inst->varMapA[ idx ] = var;
+          }
         
       }
 
@@ -322,85 +329,238 @@ namespace cw
       return rc;
       
     }
-    
-    rc_t _create_instance( flow_t* p, const object_t* inst_cfg )
+
+    rc_t _preset_channelize_vars( instance_t* inst, const char* type_src_label, const char* preset_label, const object_t* preset_cfg )
     {
-      rc_t            rc              = kOkRC;
-      const char*     inst_label      = nullptr;
-      const char*     inst_clas_label = nullptr;
-      const object_t* in_dict         = nullptr;
-      const char*     arg_label       = nullptr;
-      const char*     preset_label    = nullptr;
-      const object_t* arg_dict        = nullptr;
-      const object_t* arg_cfg         = nullptr;
-      instance_t*     inst            = nullptr;
-      class_desc_t*   class_desc      = nullptr;
+      rc_t rc = kOkRC;
+
+      //cwLogInfo("Channelizing '%s' preset %i vars for '%s'.",type_src_label, preset_cfg==nullptr ? 0 : preset_cfg->child_count(), inst->label );
+      
+      // validate the syntax of the preset record
+      if( !preset_cfg->is_dict() )
+      {
+        rc = cwLogError(kSyntaxErrorRC,"The preset record '%s' on %s '%s' is not a dictionary.", preset_label, type_src_label, inst->class_desc->label );
+        goto errLabel;
+      }
+
+
+      // for each preset variable
+      for(unsigned i=0; i<preset_cfg->child_count(); ++i)
+      {
+        const object_t* value       = preset_cfg->child_ele(i)->pair_value();
+        const char*     value_label = preset_cfg->child_ele(i)->pair_label();
+        variable_t*     dummy       = nullptr;
+
+        // verify that a valid value exists
+        if( value == nullptr )
+        {
+          rc = cwLogError(kSyntaxErrorRC,"Unexpected missig value on %s preset '%s' instance '%s' variable '%s'.", type_src_label, preset_label, inst->label, cwStringNullGuard(value_label) );
+          goto errLabel;
+        }
+
+        // if a list of values was given
+        if( value->is_list() )
+        {
+          for(unsigned chIdx=0; chIdx<value->child_count(); ++chIdx)
+            if((rc = var_channelize( inst, value_label, chIdx, value->child_ele(chIdx), dummy )) != kOkRC )
+              goto errLabel;
+        }
+        else // otherwise a single value was given
+        {          
+          if((rc = var_channelize( inst, value_label, kAnyChIdx, value, dummy )) != kOkRC )
+            goto errLabel;
+        }
+        
+        
+      }
+
+    errLabel:
+      if( rc != kOkRC )
+        rc = cwLogError(rc,"Apply %s preset failed on instance:%s class:%s preset:%s.", type_src_label, inst->label, inst->class_desc->label, preset_label );
+
+      return rc;
+    }
+
+
+    
+    rc_t _class_preset_channelize_vars( instance_t* inst, const char* preset_label )
+    {
+      rc_t            rc = kOkRC;
+      const preset_t* pr;
+
+      if( preset_label == nullptr )
+        return kOkRC;
+      
+      // locate the requestd preset record
+      if((pr = class_preset_find(inst->class_desc, preset_label)) == nullptr )
+      {
+        rc = cwLogError(kInvalidIdRC,"The preset '%s' could not be found for the instance '%s'.", preset_label, inst->label);
+        goto errLabel;
+      }
+      
+      rc = _preset_channelize_vars( inst, "class", preset_label, pr->cfg);
+      
+    errLabel:                  
+      return rc;
+    }
+
+
+    rc_t _class_apply_presets( instance_t* inst, const object_t* preset_labels )
+    {
+      rc_t        rc = kOkRC;
+      const char* s  = nullptr;
+      
+      // if preset_labels is a string
+      if( preset_labels->is_string() && preset_labels->value(s)==kOkRC )
+        return _class_preset_channelize_vars(inst,s);
+
+      // if the preset_labels is a list
+      if( !preset_labels->is_list() )
+        rc = cwLogError(kSyntaxErrorRC,"The preset list on instance '%s' is neither a list nor a string.",inst->label);
+      else
+      {
+        // for each label listed in the preset label list
+        for(unsigned i=0; i<preset_labels->child_count(); ++i)
+        {
+          const object_t* label_obj = preset_labels->child_ele(i);
+
+          // verify that the label is a strng
+          if( !label_obj->is_string() || label_obj->value(s) != kOkRC )
+          {
+            rc = cwLogError(kSyntaxErrorRC,"The preset list does not contain string on instance '%s'.",inst->label);
+            goto errLabel;
+          }
+
+          // apply a preset label
+          if((rc = _class_preset_channelize_vars( inst, s)) != kOkRC )
+            goto errLabel;          
+        }
+      }
+      
+    errLabel:
+      return rc;
+    }
+                               
+                                 
+    
+
+    rc_t _inst_args_channelize_vars( instance_t* inst, const char* arg_label, const object_t* arg_cfg )
+    {
+      rc_t rc = kOkRC;
+      
+      if( arg_cfg == nullptr )
+        return rc;
+
+      return _preset_channelize_vars( inst, "instance", arg_label, arg_cfg );
+      
+    }
+
+    typedef struct inst_parse_vars_str
+    {
+      const char*     inst_label;
+      const char*     inst_clas_label;
+      const object_t* in_dict;
+      const char*     arg_label;
+      const object_t* preset_labels;
+      const object_t* arg_cfg;
+    } inst_parse_vars_t;
+
+    rc_t _parse_instance_cfg( flow_t* p, const object_t* inst_cfg, inst_parse_vars_t& pvars )
+    {
+      rc_t            rc       = kOkRC;
+      const object_t* arg_dict = nullptr;
       
       // validate the syntax of the inst_cfg pair
       if( inst_cfg == nullptr || !inst_cfg->is_pair() || inst_cfg->pair_label()==nullptr || inst_cfg->pair_value()==nullptr )
       {
-        rc = cwLogError(kSyntaxErrorRC,"The instance cfg. is not a valid pair.");
+        rc = cwLogError(kSyntaxErrorRC,"The instance cfg. is not a valid pair. No instance label could be parsed.");
         goto errLabel;
       }
       
-      inst_label = inst_cfg->pair_label();
+      pvars.inst_label = inst_cfg->pair_label();
 
       // verify that the instance label is unique
-      if( instance_find(p,inst_label) != nullptr )
+      if( instance_find(p,pvars.inst_label) != nullptr )
       {
-        rc = cwLogError(kSyntaxErrorRC,"The instance label '%s' has already been used.",inst_label);
+        rc = cwLogError(kSyntaxErrorRC,"The instance label '%s' has already been used.",pvars.inst_label);
         goto errLabel;
       }
       
       // get the instance class label
-      if((rc = inst_cfg->getv("class",inst_clas_label)) != kOkRC )
+      if((rc = inst_cfg->getv("class",pvars.inst_clas_label)) != kOkRC )
       {
-        rc = cwLogError(kSyntaxErrorRC,"The instance cfg. %s is missing: 'type'.",inst_label);
+        rc = cwLogError(kSyntaxErrorRC,"The instance cfg. %s is missing: 'type'.",pvars.inst_label);
         goto errLabel;        
       }
       
       // parse the optional args
       if((rc = inst_cfg->getv_opt("args",     arg_dict,
-                                  "in",       in_dict,
-                                  "argLabel", arg_label,
-                                  "preset",   preset_label)) != kOkRC )
+                                  "in",       pvars.in_dict,
+                                  "argLabel", pvars.arg_label,
+                                  "preset",   pvars.preset_labels)) != kOkRC )
       {
-        rc = cwLogError(kSyntaxErrorRC,"The instance cfg. '%s' missing: 'type'.",inst_label);
+        rc = cwLogError(kSyntaxErrorRC,"The instance cfg. '%s' missing: 'type'.",pvars.inst_label);
         goto errLabel;        
       }
 
-      // if an argument dict was given
+      // if an argument dict was given in the instanec cfg
       if( arg_dict != nullptr  )
       {
         bool rptErrFl = true;
-        
-        // if no label was given then try 'default'
-        if( arg_label == nullptr)
+
+        // verify the arg. dict is actually a dict.
+        if( !arg_dict->is_dict() )
         {
-          arg_label = "default";
-          rptErrFl = false;
+          cwLogError(kSyntaxErrorRC,"The instance argument dictionary on instance '%s' is not a dictionary.",pvars.inst_label);
+          goto errLabel;
         }
         
-        if((arg_cfg = arg_dict->find_child(arg_label)) == nullptr )
+        // if no label was given then try 'default'
+        if( pvars.arg_label == nullptr)
+        {
+          pvars.arg_label = "default";
+          rptErrFl = false;
+        }
+
+        // locate the specified argument record
+        if((pvars.arg_cfg = arg_dict->find_child(pvars.arg_label)) == nullptr )
         {
 
           // if an explicit arg. label was given but it was not found
           if( rptErrFl )
           {
-            rc = cwLogError(kSyntaxErrorRC,"The argument cfg. '%s' was not found on instance cfg. '%s'.",arg_label,inst_label);
+            rc = cwLogError(kSyntaxErrorRC,"The argument cfg. '%s' was not found on instance cfg. '%s'.",pvars.arg_label,pvars.inst_label);
             goto errLabel;
           }
 
-          // no explicit arg. label was given - make arg_dict the instance arg cff.
-          arg_cfg = arg_dict;
-          arg_label = nullptr;
+          // no explicit arg. label was given - make arg_dict the instance arg cfg.
+          pvars.arg_cfg = arg_dict;
+          pvars.arg_label = nullptr;
         }        
       }
 
+    errLabel:
+      if( rc != kOkRC )
+        rc = cwLogError(kSyntaxErrorRC,"Configuration parsing failed on instance: '%s'.", cwStringNullGuard(pvars.inst_label) );
+      
+      return rc;
+    }
+    
+    rc_t _create_instance( flow_t* p, const object_t* inst_cfg )
+    {
+      rc_t              rc         = kOkRC;
+      inst_parse_vars_t pvars      = {0};
+      instance_t*       inst       = nullptr;
+      class_desc_t*     class_desc = nullptr;      
+
+      // parse the instance configuration 
+      if((rc = _parse_instance_cfg( p, inst_cfg, pvars )) != kOkRC )
+        goto errLabel;
+        
       // locate the class desc
-      if(( class_desc = class_desc_find(p,inst_clas_label)) == nullptr )
+      if(( class_desc = class_desc_find(p,pvars.inst_clas_label)) == nullptr )
       {
-        rc = cwLogError(kSyntaxErrorRC,"The flow class '%s' was not found.",cwStringNullGuard(inst_clas_label));
+        rc = cwLogError(kSyntaxErrorRC,"The flow class '%s' was not found.",cwStringNullGuard(pvars.inst_clas_label));
         goto errLabel;
       }
 
@@ -408,47 +568,67 @@ namespace cw
       inst = mem::allocZ<instance_t>();
 
       inst->ctx          = p;
-      inst->label        = inst_label;
+      inst->label        = pvars.inst_label;
       inst->inst_cfg     = inst_cfg;
-      inst->arg_label    = arg_label;
-      inst->arg_cfg      = arg_cfg;
+      inst->arg_label    = pvars.arg_label;
+      inst->arg_cfg      = pvars.arg_cfg;
       inst->class_desc   = class_desc;
-      inst->preset_label = preset_label;
       
-      // Instantiate the variables which have the 'src' attribute. We need these variables
-      // to exist so that they can be connected to their source prior to the instance 
-      // custom constructorbeing exected
+      // Instantiate all the variables in the class description
       for(var_desc_t* vd=class_desc->varDescL; vd!=nullptr; vd=vd->link)
       {
-        variable_t* var = nullptr;
-        
-        if( cwIsFlag(vd->flags,kSrcVarFl) )
-        {
-          if((rc = var_create( inst, vd->label, kInvalidId, kAnyChIdx, var )) != kOkRC )
-            goto errLabel;
-        }
-      } 
+        variable_t* var = nullptr;        
+        if((rc = var_create( inst, vd->label, kInvalidId, kAnyChIdx, vd->val_cfg, var )) != kOkRC )
+          goto errLabel;
+      }
+
+      // All the variables that can be used by this instance have now been created
+      // and the chIdx of each variable is set to 'any'.
+
+      // If a 'preset' field was included in the instance cfg then apply the specified class preset
+      if( pvars.preset_labels != nullptr )      
+        if((rc = _class_apply_presets(inst, pvars.preset_labels )) != kOkRC )
+          goto errLabel;
+
+      // All the class presets values have now been set and those variables
+      // that were expressed with a list have numeric channel indexes assigned.
+
+      // Apply the instance preset values.
+      if( pvars.arg_cfg != nullptr )
+        if((rc = _inst_args_channelize_vars( inst, pvars.arg_label, pvars.arg_cfg )) != kOkRC )
+          goto errLabel;
+
+      // All the instance arg values have now been set and those variables
+      // that were expressed with a list have numeric channel indexes assigned.
+
+
+      // TODO: Should the 'all' variable be removed for variables that have numeric channel indexes.
 
       // connect the variable lists in the instance 'in' dictionary
-      if( in_dict != nullptr && in_dict->is_dict() )
+      if( pvars.in_dict != nullptr )
       {
-        // for each input
-        for(unsigned i=0; i<in_dict->child_count(); ++i)
+        if( !pvars.in_dict->is_dict() )
         {
-          const object_t*   in_pair      = in_dict->child_ele(i);
+          cwLogError(kSyntaxErrorRC,"The 'in' dict in instance '%s' is not a valid dictionary.",inst->label);
+          goto errLabel;
+        }
+        
+        // for each input variable in the 'in' set
+        for(unsigned i=0; i<pvars.in_dict->child_count(); ++i)
+        {
+          const object_t*   in_pair      = pvars.in_dict->child_ele(i);
           const char*       in_var_label = in_pair->pair_label();
           const char*       src_label    = nullptr;
           const var_desc_t* vd           = nullptr;
 
-          // note
+          // locate the var desc of the associated variable
           if((vd = var_desc_find( class_desc, in_var_label)) == nullptr )
           {
             cwLogError(kSyntaxErrorRC,"The value description for the 'in' value '%s' was not found on instance '%s'. Maybe '%s' is not marked as a 'src' attribute in the class variable descripiton.",in_var_label,inst->label,in_var_label);
             goto errLabel;
           }
 
-          // Note that all variable's found by the above call to var_desc_find() should be 'src'
-          // variables because they are the only ones that have been created so far.
+          // Note that all variable's found by the above call to var_desc_find() should be 'src' variables.
           assert( cwIsFlag(vd->flags,kSrcVarFl) );
 
           // if this value is a 'src' value then it must be setup prior to the instance being instantiated
@@ -459,24 +639,24 @@ namespace cw
             // locate the pointer to the referenced output abuf and store it in inst->srcABuf[i]
             if((rc = _setup_input( p, inst, in_var_label, src_label )) != kOkRC )
             {
-              rc = cwLogError(kSyntaxErrorRC,"The 'in' buffer at index %i is not valid on instance '%s'.", i, inst_label );
+              rc = cwLogError(kSyntaxErrorRC,"The 'in' buffer at index %i is not valid on instance '%s'.", i, inst->label );
               goto errLabel;
             }
           }
         }
       }
 
-      // complete the instantiation 
+      // complete the instantiation
+      
       if((rc = class_desc->members->create( inst )) != kOkRC )
       {
-        rc = cwLogError(kInvalidArgRC,"Instantiation failed on instance '%s'.", inst_label );
+        rc = cwLogError(kInvalidArgRC,"Instantiation failed on instance '%s'.", inst->label );
         goto errLabel;
       }
-
+      
       if((rc =_create_instance_var_map( inst )) != kOkRC )
         goto errLabel;
       
-
       // insert an instance in the network
       if( p->network_tail == nullptr )
       {
@@ -502,6 +682,9 @@ namespace cw
     {
       rc_t rc = kOkRC;
 
+      if( p == nullptr )
+        return rc;
+
       instance_t* i0=p->network_head;
       instance_t* i1=nullptr;
 
@@ -548,16 +731,18 @@ namespace cw
   }
 }
 
-cw::rc_t cw::flow::create( handle_t& hRef, const object_t& classCfg, const object_t& cfg )
+cw::rc_t cw::flow::create( handle_t& hRef, const object_t& classCfg, const object_t& networkCfg )
 {
   rc_t rc = kOkRC;
   const object_t* network;
+  bool printClassDictFl = false;
+  bool printNetworkFl = false;
   
   if(( rc = destroy(hRef)) != kOkRC )
     return rc;
 
   flow_t* p   = mem::allocZ<flow_t>();
-  p->cfg = &cfg;   // TODO: duplicate cfg?
+  p->cfg = &networkCfg;   // TODO: duplicate cfg?
 
   // parse the class description array
   if((rc = _parse_class_cfg(p,library,&classCfg)) != kOkRC )
@@ -567,20 +752,27 @@ cw::rc_t cw::flow::create( handle_t& hRef, const object_t& classCfg, const objec
   }
 
   // parse the main audio file processor cfg record
-  if((rc = cfg.getv("framesPerCycle",  p->framesPerCycle,
-                    "network",         network)) != kOkRC )
+  if((rc = networkCfg.getv("framesPerCycle",  p->framesPerCycle,
+                           "network",         network)) != kOkRC )
   {
     rc = cwLogError(kSyntaxErrorRC,"Error parsing the required flow configuration parameters.");
     goto errLabel;
   }
 
-  if((rc = cfg.getv_opt("maxCycleCount", p->maxCycleCount)) != kOkRC )
+  // parse the optional args
+  if((rc = networkCfg.getv_opt("maxCycleCount", p->maxCycleCount,
+                               "printClassDictFl", printClassDictFl,
+                               "printNetworkFl",   printNetworkFl)) != kOkRC )
   {
     rc = cwLogError(kSyntaxErrorRC,"Error parsing the optional flow configuration parameters.");
     goto errLabel;
   }
 
-  // for each instance in the network
+  // print the class dict
+  if( printClassDictFl )
+      class_dict_print( p );
+
+  // build the network
   for(unsigned i=0; i<network->child_count(); ++i)
   {
     const object_t* inst_cfg = network->child_ele(i);
@@ -590,18 +782,18 @@ cw::rc_t cw::flow::create( handle_t& hRef, const object_t& classCfg, const objec
     {
       rc = cwLogError(rc,"The instantiation at network index %i is invalid.",i);
       goto errLabel;
+      
     }
   }
 
-  // apply preset
-  for(instance_t* inst=p->network_head; inst!=nullptr; inst=inst->link)
-    if( inst->preset_label != nullptr )
-      if((rc = apply_preset( inst, inst->preset_label )) != kOkRC )
-        goto errLabel;    
-        
+  if( printNetworkFl )
+    network_print(p);
+
   hRef.set(p);
   
  errLabel:
+
+  
   if( rc != kOkRC )
     _destroy(p);
   
@@ -615,10 +807,16 @@ cw::rc_t cw::flow::exec(    handle_t& hRef )
 
   while( true )
   {  
-    for(instance_t* inst = p->network_head; inst!=nullptr; inst=inst->link)    
+    for(instance_t* inst = p->network_head; inst!=nullptr; inst=inst->link)
       if((rc = inst->class_desc->members->exec(inst)) != kOkRC )
         break;
-
+    
+    if( rc == kEofRC )
+    {
+      rc = kOkRC;
+      break;
+    }
+    
     p->cycleIndex += 1;
     if( p->maxCycleCount > 0 && p->cycleIndex >= p->maxCycleCount )
       break;
@@ -646,7 +844,7 @@ cw::rc_t cw::flow::destroy( handle_t& hRef )
 
 void cw::flow::print_class_list( handle_t& hRef )
 {
-  class_desc_print(_handleToPtr(hRef));
+  class_dict_print(_handleToPtr(hRef));
 }
 
 void cw::flow::print_network( handle_t& hRef )
@@ -666,8 +864,6 @@ cw::rc_t cw::flow::test( const object_t* class_cfg, const object_t* cfg )
     rc = cwLogError(rc,"Flow object create failed.");
     goto errLabel;
   }
-
-  print_network(flowH);
   
   // run the network
   if((rc = exec( flowH )) != kOkRC )
diff --git a/cwFlow.h b/cwFlow.h
index 1f51a6e..362b692 100644
--- a/cwFlow.h
+++ b/cwFlow.h
@@ -11,7 +11,7 @@ namespace cw
 
     typedef handle<struct flow_str> handle_t;
 
-    rc_t create( handle_t& hRef, const object_t& classCfg, const object_t& cfg );
+    rc_t create( handle_t& hRef, const object_t& classCfg, const object_t& networkCfg );
     rc_t exec(    handle_t& hRef );
     rc_t destroy( handle_t& hRef );
 
diff --git a/cwFlowProc.cpp b/cwFlowProc.cpp
index 94d7474..ec12ee9 100644
--- a/cwFlowProc.cpp
+++ b/cwFlowProc.cpp
@@ -6,6 +6,8 @@
 #include "cwAudioFile.h"
 #include "cwVectOps.h"
 #include "cwMtx.h"
+
+#include "cwDspTypes.h" // real_t, sample_t
 #include "cwFlow.h"
 #include "cwFlowTypes.h"
 #include "cwFlowProc.h"
@@ -14,6 +16,7 @@
 #include "cwMath.h"
 #include "cwDsp.h"
 #include "cwAudioTransforms.h"
+#include "cwDspTransforms.h"
 
 namespace cw
 {
@@ -31,8 +34,6 @@ namespace cw
         
       } inst_t;
 
-      
-    
 
       rc_t create( instance_t* ctx )
       {
@@ -83,6 +84,8 @@ namespace cw
     {
       enum
       {
+        kFnamePId,
+        kEofFlPId,
         kOutPId
       };
       
@@ -101,20 +104,14 @@ namespace cw
         inst_t* inst = mem::allocZ<inst_t>();
         ctx->userPtr = inst;
 
-        // get the audio filename
-        if((rc = ctx->arg_cfg->getv("fn",inst->filename)) != kOkRC )
+        // Register variable and get their current value
+        if((rc = var_register_and_get( ctx, kAnyChIdx,
+                                       kFnamePId, "fname", inst->filename,
+                                       kEofFlPId, "eofFl", inst->eofFl )) != kOkRC )
         {
-          rc = cwLogError(kInvalidArgRC,"The audio input file has no 'fn' argument.");
           goto errLabel;
         }
 
-        // get the 'eof' flag
-        if((rc = ctx->arg_cfg->getv_opt("eof",inst->eofFl)) != kOkRC )
-        {
-          rc = cwLogError(kInvalidArgRC,"The audio input file has no 'fn' argument.");
-          goto errLabel;
-        }
-        
         // open the audio file
         if((rc = audiofile::open(inst->afH,inst->filename,&info)) != kOkRC )
         {
@@ -125,7 +122,7 @@ namespace cw
         cwLogInfo("Audio '%s' srate:%f chs:%i frames:%i %f seconds.",inst->filename,info.srate,info.chCnt,info.frameCnt, info.frameCnt/info.srate );
 
         // create one output audio buffer
-        rc = var_abuf_create( ctx, "out", kOutPId, kAnyChIdx, info.srate, info.chCnt, ctx->ctx->framesPerCycle );
+        rc = var_register_and_set( ctx, "out", kOutPId, kAnyChIdx, info.srate, info.chCnt, ctx->ctx->framesPerCycle );
 
       errLabel:
         return rc;
@@ -162,7 +159,7 @@ namespace cw
 
 
         // verify that a source buffer exists
-        if((rc = var_abuf_get(ctx,"out",kAnyChIdx,abuf)) != kOkRC )
+        if((rc = var_get(ctx,kOutPId,kAnyChIdx,abuf)) != kOkRC )
         {
           rc = cwLogError(kInvalidStateRC,"The audio file instance '%s' does not have a valid audio output buffer.",ctx->label);
         }
@@ -175,7 +172,7 @@ namespace cw
             
           rc  = readFloat(inst->afH, abuf->frameN, 0, abuf->chN, chBuf, &actualFrameN );
           
-          if( inst->eofFl && actualFrameN == 0)
+          if( inst->eofFl && actualFrameN == 0)            
             rc = kEofRC;
         }
         
@@ -186,7 +183,8 @@ namespace cw
         .create = create,
         .destroy = destroy,
         .value   = value,
-        .exec = exec
+        .exec = exec,
+        .report = nullptr
       };
       
     }
@@ -201,13 +199,15 @@ namespace cw
     {
       enum
       {
-        kInPId
+        kInPId,
+        kFnamePId
       };
       
       typedef struct
       {
         audiofile::handle_t afH;
-        const char*         filename;        
+        const char*         filename;
+        unsigned            durSmpN;
       } inst_t;
       
       rc_t create( instance_t* ctx )
@@ -215,20 +215,14 @@ namespace cw
         rc_t          rc            = kOkRC;                 //
         unsigned      audioFileBits = 0;                     // set audio file sample format to 'float32'.
         inst_t*       inst          = mem::allocZ<inst_t>(); //
-        abuf_t*       src_abuf      = nullptr;
+        const abuf_t*       src_abuf      = nullptr;
         ctx->userPtr = inst;
 
-        // get the audio filename
-        if((rc = ctx->arg_cfg->getv("fn",inst->filename)) != kOkRC )
+        // Register variables and get their current value
+        if((rc = var_register_and_get( ctx, kAnyChIdx,
+                                       kFnamePId, "fname", inst->filename,
+                                       kInPId,    "in",    src_abuf)) != kOkRC )
         {
-          rc = cwLogError(kInvalidArgRC,"The audio input file has no 'fn' argument.");
-          goto errLabel;
-        }
-        
-        // verify that a source buffer exists
-        if((rc = var_abuf_get(ctx,"in",kAnyChIdx,src_abuf)) != kOkRC )
-        {
-          rc = cwLogError(kInvalidStateRC,"The audio file instance '%s' does not have a valid input connection.",ctx->label);
           goto errLabel;
         }
 
@@ -239,8 +233,6 @@ namespace cw
           goto errLabel;
         }
 
-        rc = var_init( ctx, kAnyChIdx, kInPId, "in", src_abuf);
-        
       errLabel:
         return rc;
       }
@@ -275,7 +267,7 @@ namespace cw
         inst_t*       inst   = (inst_t*)ctx->userPtr;
         const abuf_t* src_abuf = nullptr;
 
-        if((rc = var_abuf_get(ctx,"in",kAnyChIdx,src_abuf)) != kOkRC )
+        if((rc = var_get(ctx,kInPId,kAnyChIdx,src_abuf)) != kOkRC )
           rc = cwLogError(kInvalidStateRC,"The audio file instance '%s' does not have a valid input connection.",ctx->label);
         else
         {
@@ -286,6 +278,12 @@ namespace cw
         
           if((rc = audiofile::writeFloat(inst->afH, src_abuf->frameN, src_abuf->chN, chBuf )) != kOkRC )
             rc = cwLogError(rc,"Audio file write failed on instance: '%s'.", ctx->label );
+
+          // print a minutes counter
+          inst->durSmpN += src_abuf->frameN;          
+          if( inst->durSmpN % ((unsigned)src_abuf->srate*60) == 0 )
+            printf("%5.1f %s\n", inst->durSmpN/(src_abuf->srate*60));
+          
         }
         
         return rc;
@@ -295,7 +293,8 @@ namespace cw
         .create = create,
         .destroy = destroy,
         .value = value,
-        .exec = exec
+        .exec = exec,
+        .report = nullptr
       };
       
     }
@@ -310,12 +309,16 @@ namespace cw
 
       enum {
         kInPId,
+        kHopSmpNPId,
+        kWndSmpNPId,
+        kHzFlPId,
         kOutPId
       };
       
       typedef struct
       {
         pv_t**   pvA;       // pvA[ srcBuf.chN ]
+        unsigned pvN;
         unsigned wndSmpN;
         unsigned hopSmpN;
         bool     hzFl;
@@ -330,32 +333,19 @@ namespace cw
         inst_t*       inst   = mem::allocZ<inst_t>();
         ctx->userPtr = inst;
 
-        // get the wnd/hop sample count
-        if((rc = ctx->arg_cfg->getv("wndSmpCnt",inst->wndSmpN,
-                                    "hopSmpCnt",inst->hopSmpN )) != kOkRC )
+        if((rc = var_register_and_get( ctx, kAnyChIdx,
+                                       kInPId, "in", srcBuf,
+                                       kHopSmpNPId, "hopSmpN", inst->hopSmpN,
+                                       kWndSmpNPId, "wndSmpN", inst->wndSmpN,
+                                       kHzFlPId,    "hzFl",    inst->hzFl )) != kOkRC )
         {
-          rc = cwLogError(kSyntaxErrorRC,"PV Analysis required parameters parse failed on instance '%s'.",ctx->label);
-          goto errLabel;
-        }
-
-        // get the optional arg's.
-        if((rc = ctx->arg_cfg->getv_opt("hzFl",inst->hzFl)) != kOkRC )
-        {
-          rc = cwLogError(kSyntaxErrorRC,"PV Analysis optional parameters parse failed on instance '%s'.",ctx->label);
-          goto errLabel;          
-        }
-        
-        // verify that a source buffer exists
-        if((rc = var_abuf_get(ctx,"in", kAnyChIdx, srcBuf )) != kOkRC )
-        {
-          rc = cwLogError(rc,"The instance '%s' does not have a valid input connection.",ctx->label);
           goto errLabel;
         }
         else
         {
-
           flags  = inst->hzFl ? dsp::pv_anl::kCalcHzPvaFl : dsp::pv_anl::kNoCalcHzPvaFl;
-          inst->pvA = mem::allocZ<pv_t*>( srcBuf->chN );  // allocate pv channel array
+          inst->pvN = srcBuf->chN;
+          inst->pvA = mem::allocZ<pv_t*>( inst->pvN );  // allocate pv channel array
           const sample_t* magV[ srcBuf->chN ];
           const sample_t* phsV[ srcBuf->chN ];
           const sample_t* hzV[  srcBuf->chN ];
@@ -374,11 +364,12 @@ namespace cw
             hzV[i]  = inst->pvA[i]->hzV;
           }
 
-          if((rc = var_init( ctx, kAnyChIdx, kInPId, "in", srcBuf )) != kOkRC )
+          if((rc = var_register( ctx, kAnyChIdx, kInPId, "in" )) != kOkRC )
             goto errLabel;
           
           // create the fbuf 'out'
-          rc = var_fbuf_create( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, inst->pvA[0]->binCnt, inst->pvA[0]->hopSmpCnt, magV, phsV, hzV );
+          rc = var_register_and_set( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, inst->pvA[0]->binCnt, inst->pvA[0]->hopSmpCnt, magV, phsV, hzV );
+        
         }
         
       errLabel:
@@ -390,6 +381,11 @@ namespace cw
         rc_t rc = kOkRC;
 
         inst_t* inst = (inst_t*)ctx->userPtr;
+        
+        for(unsigned i=0; i<inst->pvN; ++i)
+           destroy(inst->pvA[i]);
+        
+        mem::release(inst->pvA);
         mem::release(inst);
         
         return rc;
@@ -409,14 +405,14 @@ namespace cw
         fbuf_t*       dstBuf = nullptr;
 
         // verify that a source buffer exists
-        if((rc = var_abuf_get(ctx,"in", kAnyChIdx, srcBuf )) != kOkRC )
+        if((rc = var_get(ctx,kInPId, kAnyChIdx, srcBuf )) != kOkRC )
         {
           rc = cwLogError(rc,"The instance '%s' does not have a valid input connection.",ctx->label);
           goto errLabel;
         }
 
         // verify that the dst buffer exits
-        if((rc = var_fbuf_get(ctx,"out", kAnyChIdx, dstBuf)) != kOkRC )
+        if((rc = var_get(ctx,kOutPId, kAnyChIdx, dstBuf)) != kOkRC )
         {
           rc = cwLogError(rc,"The instance '%s' does not have a valid output.",ctx->label);
           goto errLabel;
@@ -425,11 +421,17 @@ namespace cw
         // for each input channel
         for(unsigned i=0; i<srcBuf->chN; ++i)
         {
+          dstBuf->readyFlV[i] = false;
+          
           // call the PV analysis processor
-          dsp::pv_anl::exec( inst->pvA[i], srcBuf->buf + i*srcBuf->frameN, srcBuf->frameN );
+          if( dsp::pv_anl::exec( inst->pvA[i], srcBuf->buf + i*srcBuf->frameN, srcBuf->frameN ) )
+          {
+            // rescale the frequency domain magnitude
+            vop::mul(dstBuf->magV[i], dstBuf->binN/2, dstBuf->binN);
+            
+            dstBuf->readyFlV[i] = true;
 
-          // rescale the frequency domain magnitude
-          vop::mul(dstBuf->magV[i], dstBuf->binN/2, dstBuf->binN);
+          }
         }
 
       errLabel:
@@ -440,7 +442,8 @@ namespace cw
         .create  = create,
         .destroy = destroy,
         .value   = value,
-        .exec    = exec
+        .exec    = exec,
+        .report  = nullptr
       };  
     }    
 
@@ -461,6 +464,7 @@ namespace cw
       typedef struct
       {
         pv_t**   pvA;     // pvA[ srcBuf.chN ]
+        unsigned pvN;
         unsigned wndSmpN; //  
         unsigned hopSmpN; //
         bool     hzFl;    //
@@ -474,18 +478,16 @@ namespace cw
         inst_t*       inst   = mem::allocZ<inst_t>();
         ctx->userPtr = inst;
 
-        
-        // verify that a source buffer exists
-        if((rc = var_fbuf_get(ctx,"in", kAnyChIdx, srcBuf )) != kOkRC )
+        if((rc = var_register_and_get( ctx, kAnyChIdx,kInPId, "in", srcBuf)) != kOkRC )
         {
-          rc = cwLogError(rc,"The instance '%s' does not have a valid input connection.",ctx->label);
           goto errLabel;
         }
         else
         {
 
           // allocate pv channel array
-          inst->pvA = mem::allocZ<pv_t*>( srcBuf->chN );  
+          inst->pvN = srcBuf->chN;
+          inst->pvA = mem::allocZ<pv_t*>( inst->pvN );  
 
           // create a pv anlaysis object for each input channel
           for(unsigned i=0; i<srcBuf->chN; ++i)
@@ -499,11 +501,11 @@ namespace cw
             }
           }
 
-          if((rc = var_init( ctx, kAnyChIdx, kInPId, "in", srcBuf )) != kOkRC )
+          if((rc = var_register( ctx, kAnyChIdx, kInPId, "in" )) != kOkRC )
             goto errLabel;
 
           // create the abuf 'out'
-          rc = var_abuf_create( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, ctx->ctx->framesPerCycle );
+          rc = var_register_and_set( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, ctx->ctx->framesPerCycle );
         }
         
       errLabel:
@@ -515,6 +517,10 @@ namespace cw
         rc_t rc = kOkRC;
 
         inst_t* inst = (inst_t*)ctx->userPtr;
+        for(unsigned i=0; i<inst->pvN; ++i)
+          destroy(inst->pvA[i]);
+        
+        mem::release(inst->pvA);
         mem::release(inst);
         
         return rc;
@@ -534,18 +540,23 @@ namespace cw
         abuf_t*       dstBuf = nullptr;
         
         // get the src buffer
-        if((rc = var_fbuf_get(ctx,"in", kAnyChIdx, srcBuf )) != kOkRC )
+        if((rc = var_get(ctx,kInPId, kAnyChIdx, srcBuf )) != kOkRC )
           goto errLabel;
 
         // get the dst buffer
-        if((rc = var_abuf_get(ctx,"out", kAnyChIdx, dstBuf)) != kOkRC )
+        if((rc = var_get(ctx,kOutPId, kAnyChIdx, dstBuf)) != kOkRC )
           goto errLabel;
         
         for(unsigned i=0; i<srcBuf->chN; ++i)
         {
-          dsp::pv_syn::exec( inst->pvA[i], srcBuf->magV[i], srcBuf->phsV[i] );
-
-          abuf_set_channel( dstBuf, i, inst->pvA[i]->ola->outV, inst->pvA[i]->ola->hopSmpCnt );
+          if( srcBuf->readyFlV[i] )
+            dsp::pv_syn::exec( inst->pvA[i], srcBuf->magV[i], srcBuf->phsV[i] );
+          
+          const sample_t* ola_out = dsp::ola::execOut(inst->pvA[i]->ola);
+          if( ola_out != nullptr )
+            abuf_set_channel( dstBuf, i, ola_out, inst->pvA[i]->ola->procSmpCnt );
+          
+          //abuf_set_channel( dstBuf, i, inst->pvA[i]->ola->outV, dstBuf->frameN );
         }
         
 
@@ -557,7 +568,8 @@ namespace cw
         .create  = create,
         .destroy = destroy,
         .value   = value,
-        .exec    = exec
+        .exec    = exec,
+        .report  = nullptr
       };      
     }
 
@@ -585,6 +597,7 @@ namespace cw
       typedef struct
       {
         spec_dist_t** sdA;
+        unsigned sdN;
       } inst_t;
     
 
@@ -597,7 +610,7 @@ namespace cw
         ctx->userPtr = inst;
 
         // verify that a source buffer exists
-        if((rc = var_fbuf_get(ctx,"in", kAnyChIdx, srcBuf )) != kOkRC )
+        if((rc = var_register_and_get(ctx, kAnyChIdx,kInPId,"in",srcBuf )) != kOkRC )
         {
           rc = cwLogError(rc,"The instance '%s' does not have a valid input connection.",ctx->label);
           goto errLabel;
@@ -605,12 +618,15 @@ namespace cw
         else
         {
           // allocate pv channel array
-          inst->sdA = mem::allocZ<spec_dist_t*>( srcBuf->chN );  
+          inst->sdN = srcBuf->chN;
+          inst->sdA = mem::allocZ<spec_dist_t*>( inst->sdN );  
 
           const sample_t* magV[ srcBuf->chN ];
           const sample_t* phsV[ srcBuf->chN ];
           const sample_t*  hzV[ srcBuf->chN ];
-          
+
+          //if((rc = var_register(ctx, kAnyChIdx, kInPId, "in")) != kOkRC )
+          //  goto errLabel;
         
           // create a spec_dist object for each input channel
           for(unsigned i=0; i<srcBuf->chN; ++i)
@@ -626,14 +642,15 @@ namespace cw
             phsV[i] = inst->sdA[i]->outPhsV;
             hzV[i]  = nullptr;
 
-            if((rc = var_init( ctx, i,
-                               kInPId,      "in",       srcBuf,
-                               kCeilingPId, "ceiling",  30.0f,
-                               kExpoPId,    "expo",      3.0f,
-                               kThreshPId,  "thresh",   54.0f,
-                               kUprSlopePId,"uprSlope", -0.7f,
-                               kLwrSlopePId,"lwrSlope",  2.0f,
-                               kMixPId,     "mix",       0.0f )) != kOkRC )
+            spec_dist_t* sd = inst->sdA[i];
+
+            if((rc = var_register_and_get( ctx, i,
+                                           kCeilingPId,  "ceiling",  sd->ceiling,
+                                           kExpoPId,     "expo",     sd->expo,
+                                           kThreshPId,   "thresh",   sd->thresh,
+                                           kUprSlopePId, "upr",      sd->uprSlope,
+                                           kLwrSlopePId, "lwr",      sd->lwrSlope,
+                                           kMixPId,      "mix",      sd->mix )) != kOkRC )
             {
               goto errLabel;
             }
@@ -641,7 +658,7 @@ namespace cw
           }
           
           // create the output buffer
-          if((rc = var_fbuf_create( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, srcBuf->binN, srcBuf->hopSmpN, magV, phsV, hzV )) != kOkRC )
+          if((rc = var_register_and_set( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, srcBuf->binN, srcBuf->hopSmpN, magV, phsV, hzV )) != kOkRC )
             goto errLabel;
         }
         
@@ -654,6 +671,10 @@ namespace cw
         rc_t rc = kOkRC;
 
         inst_t* inst = (inst_t*)ctx->userPtr;
+        for(unsigned i=0; i<inst->sdN; ++i)
+          destroy(inst->sdA[i]);
+        
+        mem::release(inst->sdA);
         mem::release(inst);
         
         return rc;
@@ -661,7 +682,24 @@ namespace cw
       
       rc_t value( instance_t* ctx, variable_t* var )
       {
-        rc_t rc = kOkRC;
+        rc_t    rc   = kOkRC;
+        inst_t* inst = (inst_t*)ctx->userPtr;
+
+        if( var->chIdx != kAnyChIdx && var->chIdx < inst->sdN )
+        {
+          switch( var->vid )
+          {
+            case kCeilingPId:  var_get( var, inst->sdA[ var->chIdx ]->ceiling );  break;
+            case kExpoPId:     var_get( var, inst->sdA[ var->chIdx ]->expo );     break;
+            case kThreshPId:   var_get( var, inst->sdA[ var->chIdx ]->thresh );   break;
+            case kUprSlopePId: var_get( var, inst->sdA[ var->chIdx ]->uprSlope ); break;
+            case kLwrSlopePId: var_get( var, inst->sdA[ var->chIdx ]->lwrSlope ); break;
+            case kMixPId:      var_get( var, inst->sdA[ var->chIdx ]->mix );      break;
+            default:
+              cwLogWarning("Unhandled variable id '%i' on instance: %s.", var->vid, ctx->label );
+          }
+        }
+        
         return rc;
       }
 
@@ -671,23 +709,30 @@ namespace cw
         inst_t*       inst   = (inst_t*)ctx->userPtr;
         const fbuf_t* srcBuf = nullptr;
         fbuf_t*       dstBuf = nullptr;
+        unsigned      chN    = 0;
         
         // get the src buffer
-        if((rc = var_fbuf_get(ctx,"in", kAnyChIdx, srcBuf )) != kOkRC )
+        if((rc = var_get(ctx,kInPId, kAnyChIdx, srcBuf )) != kOkRC )
           goto errLabel;
 
         // get the dst buffer
-        if((rc = var_fbuf_get(ctx,"out", kAnyChIdx, dstBuf)) != kOkRC )
+        if((rc = var_get(ctx,kOutPId, kAnyChIdx, dstBuf)) != kOkRC )
           goto errLabel;
-        
-        for(unsigned i=0; i<srcBuf->chN; ++i)
-        {
-          dsp::spec_dist::exec( inst->sdA[i], srcBuf->magV[i], srcBuf->phsV[i], srcBuf->binN );
 
-          //if( i == 0 )
-          //  printf("%f %f\n", vop::sum(srcBuf->magV[i],srcBuf->binN), vop::sum(dstBuf->magV[i], dstBuf->binN) );
+        chN = std::min(srcBuf->chN,inst->sdN);
+                
+        for(unsigned i=0; i<chN; ++i)
+        {
+          dstBuf->readyFlV[i] = false;
+          if( srcBuf->readyFlV[i] )
+          {          
+            dsp::spec_dist::exec( inst->sdA[i], srcBuf->magV[i], srcBuf->phsV[i], srcBuf->binN );
+
+            dstBuf->readyFlV[i] = true;
+            //If == 0 )
+            //  printf("%f %f\n", vop::sum(srcBuf->magV[i],srcBuf->binN), vop::sum(dstBuf->magV[i], dstBuf->binN) );
+          }
         }
-        
 
       errLabel:
         return rc;
@@ -697,10 +742,200 @@ namespace cw
         .create  = create,
         .destroy = destroy,
         .value   = value,
-        .exec    = exec
+        .exec    = exec,
+        .report  = nullptr
       };      
     }
 
+    //------------------------------------------------------------------------------------------------------------------
+    //
+    // Compressor
+    //
+    namespace compressor
+    {
+
+      enum
+      {       
+        kInPId,
+        kBypassPId,
+        kInGainPId,
+        kThreshPId,
+        kRatioPId,
+        kAtkMsPId,
+        kRlsMsPId,
+        kWndMsPId,
+        kMaxWndMsPId,
+        kOutGainPId,
+        kOutPId,
+        kEnvPId
+      };
+
+
+      typedef dsp::compressor::obj_t compressor_t;
+      
+      typedef struct
+      {
+        compressor_t** cmpA;
+        unsigned       cmpN;
+      } inst_t;
+    
+
+      rc_t create( instance_t* ctx )
+      {
+        rc_t          rc     = kOkRC;
+        const abuf_t* srcBuf = nullptr; //
+        inst_t*       inst   = mem::allocZ<inst_t>();
+        
+        ctx->userPtr = inst;
+
+        // verify that a source buffer exists
+        if((rc = var_register_and_get(ctx, kAnyChIdx,kInPId,"in",srcBuf )) != kOkRC )
+        {
+          rc = cwLogError(rc,"The instance '%s' does not have a valid input connection.",ctx->label);
+          goto errLabel;
+        }
+        else
+        {
+          // allocate pv channel array
+          inst->cmpN = srcBuf->chN;
+          inst->cmpA = mem::allocZ<compressor_t*>( inst->cmpN );  
+        
+          // create a compressor object for each input channel
+          for(unsigned i=0; i<srcBuf->chN; ++i)
+          {
+            real_t igain, maxWnd_ms, wnd_ms, thresh, ratio, atk_ms, rls_ms, ogain, bypassFl;
+
+
+            // get the compressor variable values
+            if((rc = var_register_and_get( ctx, i,
+                                           kBypassPId,   "bypass",    bypassFl,
+                                           kInGainPId,   "igain",     igain,
+                                           kThreshPId,   "thresh",    thresh,
+                                           kRatioPId,    "ratio",     ratio,
+                                           kAtkMsPId,    "atk_ms",    atk_ms,
+                                           kRlsMsPId,    "rls_ms",    rls_ms,
+                                           kWndMsPId,    "wnd_ms",    wnd_ms,
+                                           kMaxWndMsPId, "maxWnd_ms", maxWnd_ms,
+                                           kOutGainPId,  "ogain",     ogain )) != kOkRC )
+            {
+              goto errLabel;
+            }
+
+            // create the compressor instance
+            if((rc = dsp::compressor::create( inst->cmpA[i], srcBuf->srate, srcBuf->frameN, igain, maxWnd_ms, wnd_ms, thresh, ratio, atk_ms, rls_ms, ogain, bypassFl)) != kOkRC )
+            {
+              rc = cwLogError(kOpFailRC,"The 'compressor' object create failed on the instance '%s'.",ctx->label);
+              goto errLabel;
+            }
+                
+          }
+          
+          // create the output audio buffer
+          if((rc = var_register_and_set( ctx, "out", kOutPId, kAnyChIdx, srcBuf->srate, srcBuf->chN, srcBuf->frameN )) != kOkRC )
+            goto errLabel;
+        }
+        
+      errLabel:
+        return rc;
+      }
+
+      rc_t destroy( instance_t* ctx )
+      {
+        rc_t rc = kOkRC;
+
+        inst_t* inst = (inst_t*)ctx->userPtr;
+        for(unsigned i=0; i<inst->cmpN; ++i)
+          destroy(inst->cmpA[i]);
+        
+        mem::release(inst->cmpA);
+        mem::release(inst);
+        
+        return rc;
+      }
+      
+      rc_t value( instance_t* ctx, variable_t* var )
+      {
+        rc_t    rc   = kOkRC;
+        inst_t* inst = (inst_t*)ctx->userPtr;
+        real_t  tmp;
+
+        if( var->chIdx != kAnyChIdx && var->chIdx < inst->cmpN )
+        {
+          
+          switch( var->vid )
+          {
+            case kBypassPId:   var_get( var, inst->cmpA[ var->chIdx ]->bypassFl );  break;
+            case kInGainPId:   var_get( var, inst->cmpA[ var->chIdx ]->inGain );    break;
+            case kOutGainPId:  var_get( var, inst->cmpA[ var->chIdx ]->outGain );   break;
+            case kRatioPId:    var_get( var, inst->cmpA[ var->chIdx ]->ratio_num ); break;
+            case kThreshPId:   var_get( var, inst->cmpA[ var->chIdx ]->threshDb );  break;
+            case kAtkMsPId:    var_get( var, tmp ); set_attack_ms(inst->cmpA[ var->chIdx ],  tmp ); break;
+            case kRlsMsPId:    var_get( var, tmp ); set_release_ms(inst->cmpA[ var->chIdx ], tmp ); break;
+            case kWndMsPId:    var_get( var, tmp ); set_rms_wnd_ms(inst->cmpA[ var->chIdx ], tmp ); break;
+            default:
+              cwLogWarning("Unhandled variable id '%i' on instance: %s.", var->vid, ctx->label );
+          }
+        }
+        
+        
+        return rc;
+      }
+
+      rc_t exec( instance_t* ctx )
+      {
+        rc_t          rc     = kOkRC;
+        inst_t*       inst   = (inst_t*)ctx->userPtr;
+        const abuf_t* srcBuf = nullptr;
+        abuf_t*       dstBuf = nullptr;
+        unsigned      chN    = 0;
+        
+        // get the src buffer
+        if((rc = var_get(ctx,kInPId, kAnyChIdx, srcBuf )) != kOkRC )
+          goto errLabel;
+
+        // get the dst buffer
+        if((rc = var_get(ctx,kOutPId, kAnyChIdx, dstBuf)) != kOkRC )
+          goto errLabel;
+
+        chN = std::min(srcBuf->chN,inst->cmpN);
+       
+        for(unsigned i=0; i<chN; ++i)
+        {
+          dsp::compressor::exec( inst->cmpA[i], srcBuf->buf + i*srcBuf->frameN, dstBuf->buf + i*srcBuf->frameN, srcBuf->frameN );
+        }
+
+        
+        
+
+      errLabel:
+        return rc;
+      }
+
+      rc_t report( instance_t* ctx )
+      {
+        rc_t rc = kOkRC;
+        inst_t* inst = (inst_t*)ctx->userPtr;
+        for(unsigned i=0; i<inst->cmpN; ++i)
+        {
+          compressor_t* c = inst->cmpA[i];
+          cwLogInfo("%s ch:%i : sr:%f bypass:%i procSmpN:%i igain:%f threshdb:%f ratio:%f atkSmp:%i rlsSmp:%i ogain:%f rmsWndN:%i maxRmsWndN%i",
+                    ctx->label,i,c->srate,c->bypassFl,c->procSmpCnt,c->inGain,c->threshDb,c->ratio_num,c->atkSmp,c->rlsSmp,c->outGain,c->rmsWndCnt,c->rmsWndAllocCnt
+                    );
+        }
+        
+        return rc;
+      }
+
+      class_members_t members = {
+        .create  = create,
+        .destroy = destroy,
+        .value   = value,
+        .exec    = exec,
+        .report  = report
+      };      
+    }
+
+    
     
   }
 }
diff --git a/cwFlowProc.h b/cwFlowProc.h
index 6ab0329..d0292a9 100644
--- a/cwFlowProc.h
+++ b/cwFlowProc.h
@@ -2,10 +2,11 @@ namespace cw
 {
   namespace flow
   {
-    namespace audioFileIn  { extern class_members_t members; }
+    namespace audioFileIn  { extern class_members_t members;  }
     namespace audioFileOut { extern class_members_t members;  }
     namespace pv_analysis  { extern class_members_t members;  }
     namespace pv_synthesis { extern class_members_t members;  }
     namespace spec_dist    { extern class_members_t members;  }
+    namespace compressor   { extern class_members_t members;  }
   }
 }
diff --git a/cwFlowTypes.cpp b/cwFlowTypes.cpp
index 4f5919d..702ef47 100644
--- a/cwFlowTypes.cpp
+++ b/cwFlowTypes.cpp
@@ -6,6 +6,7 @@
 #include "cwObject.h"
 #include "cwVectOps.h"
 #include "cwMtx.h"
+#include "cwDspTypes.h" // real_t, sample_t
 #include "cwFlowTypes.h"
 
 
@@ -18,21 +19,19 @@ namespace cw
       { kBoolTFl, "bool" },
       { kUIntTFl, "uint" },
       { kIntTFl,  "int", },
-      { kRealTFl, "real" },
-      { kF32TFl,  "float"},
-      { kF64TFl,  "double"},
+      { kFloatTFl,  "float"},
+      { kRealTFl,   "real"},
+      { kDoubleTFl,  "double"},
       
       { kBoolMtxTFl, "bool_mtx" },
       { kUIntMtxTFl, "uint_mtx" },
       { kIntMtxTFl,  "int_mtx"  },
-      { kRealMtxTFl, "real_mtx" },
-      { kF32MtxTFl,  "float_mtx" },
-      { kF64MtxTFl,  "double_mtx" },
+      { kFloatMtxTFl,  "float_mtx" },
+      { kDoubleMtxTFl,  "double_mtx" },
       
       { kABufTFl,   "audio" },
       { kFBufTFl,   "spectrum" },
       { kStringTFl, "string" },
-      { kFNameTFl,  "fname" },
       { kTimeTFl,   "time" },
       { kInvalidTFl, nullptr }
     };
@@ -60,9 +59,8 @@ namespace cw
         case kBoolTFl:
         case kUIntTFl:
         case kIntTFl:
-        case kRealTFl:
-        case kF32TFl:
-        case kF64TFl:
+        case kFloatTFl:
+        case kDoubleTFl:
           break;
           
         case kABufTFl:
@@ -77,20 +75,15 @@ namespace cw
         case kBoolMtxTFl:
         case kUIntMtxTFl:
         case kIntMtxTFl:
-        case kRealMtxTFl:
-        case kF32MtxTFl:
-        case kF64MtxTFl:
+        case kFloatMtxTFl:
+        case kDoubleMtxTFl:
           assert(0); // not implemeneted
           break;
           
         case kStringTFl:
           mem::release( v->u.s );
           break;
-          
-        case kFNameTFl:
-          mem::release( v->u.fname );
-          break;
-          
+                    
         case kTimeTFl:
           assert(0);
           break;
@@ -103,6 +96,58 @@ namespace cw
       v->flags = kInvalidTFl;
     }
 
+    void _value_duplicate( value_t& dst, const value_t& src )
+    {
+        
+      switch( src.flags & kTypeMask )
+      {
+        case kInvalidTFl:
+          break;
+          
+        case kBoolTFl:
+        case kUIntTFl:
+        case kIntTFl:
+        case kFloatTFl:
+        case kDoubleTFl:
+          dst = src;
+          break;
+          
+        case kABufTFl:
+          
+          dst.u.abuf = src.u.abuf == nullptr ? nullptr : abuf_duplicate(src.u.abuf);
+          dst.flags = src.flags;
+          break;
+          
+        case kFBufTFl:
+          dst.u.fbuf = src.u.fbuf == nullptr ? nullptr : fbuf_duplicate(src.u.fbuf);
+          dst.flags = src.flags;
+          break;
+
+          
+        case kBoolMtxTFl:
+        case kUIntMtxTFl:
+        case kIntMtxTFl:
+        case kFloatMtxTFl:
+        case kDoubleMtxTFl:
+          assert(0); // not implemeneted
+          break;
+          
+        case kStringTFl:
+          dst.u.s = mem::duplStr( dst.u.s );
+          dst.flags = src.flags;
+          break;
+                    
+        case kTimeTFl:
+          assert(0);
+          break;
+
+        default:
+          assert(0);
+          break;
+      }
+
+    }
+    
     void _value_print( const value_t* v )
     {
       if( v == nullptr )
@@ -116,24 +161,33 @@ namespace cw
         case kBoolTFl:  printf("%s ", v->u.b ? "True" : "False" ); break;          
         case kUIntTFl:  printf("%i ", v->u.u ); break;
         case kIntTFl:   printf("%i ", v->u.i ); break;          
-        case kRealTFl:  printf("%f ", v->u.r ); break;
-        case kF32TFl:   printf("%f ", v->u.f ); break;
-        case kF64TFl:   printf("%f ", v->u.d ); break;
-        case kABufTFl:  printf("abuf: chN:%i frameN:%i srate:%8.1f ", v->u.abuf->chN, v->u.abuf->frameN, v->u.abuf->srate ); break;
-        case kFBufTFl:  printf("fbuf: chN:%i binN:%i hopSmpN:%i srate:%8.1f", v->u.fbuf->chN, v->u.fbuf->binN, v->u.fbuf->hopSmpN, v->u.fbuf->srate ); break;
-
+        case kFloatTFl: printf("%f ", v->u.f ); break;
+        case kDoubleTFl:printf("%f ", v->u.d ); break;
+        case kABufTFl:
+          if( v->u.abuf == nullptr )
+            printf("abuf: <null>");
+          else
+            printf("abuf: chN:%i frameN:%i srate:%8.1f ", v->u.abuf->chN, v->u.abuf->frameN, v->u.abuf->srate ); 
+          break;
+          
+        case kFBufTFl:
+          if( v->u.fbuf == nullptr )
+            printf("fbuf: <null>");
+          else
+            printf("fbuf: chN:%i binN:%i hopSmpN:%i srate:%8.1f", v->u.fbuf->chN, v->u.fbuf->binN, v->u.fbuf->hopSmpN, v->u.fbuf->srate );
+          break;
           
         case kBoolMtxTFl:
         case kUIntMtxTFl:
         case kIntMtxTFl:
-        case kRealMtxTFl:
-        case kF32MtxTFl:
-        case kF64MtxTFl:
+        case kFloatMtxTFl:
+        case kDoubleMtxTFl:
           assert(0); // not implemeneted
           break;
           
-        case kStringTFl: printf("%s ", v->u.s); break;
-        case kFNameTFl:  printf("%s ", v->u.fname); break;
+        case kStringTFl:
+          printf("%s ", v->u.s);
+          break;
            
         case kTimeTFl:
           assert(0);
@@ -145,41 +199,227 @@ namespace cw
       }
 
     }
+    
 
-    rc_t _var_get( instance_t* inst, unsigned vid, unsigned chIdx, unsigned typeFl, const char* typeLabel, variable_t*& varRef )
+    rc_t _val_get( const value_t* val, bool& valRef )
     {
-      rc_t     rc  = kOkRC;
-      unsigned idx = kInvalidIdx;
-
-      varRef = nullptr;
-
-      if((rc = var_map_id_to_index(inst, vid, chIdx, idx )) == kOkRC || idx == kInvalidIdx )
+      rc_t rc = kOkRC;
+      switch( val->flags & kTypeMask )
       {
-        variable_t* var = inst->varMapA[idx];
-  
-        if( !cwIsFlag(var->varDesc->type,typeFl ) )
-        {
-          rc = cwLogError(kTypeMismatchRC,"Instance:%s variable:%s is not a %s.",inst->label,var->label,typeLabel);
-          goto errLabel;
-        }
-
-        varRef = var;
+        case kBoolTFl:   valRef = val->u.b; break;
+        case kUIntTFl:   valRef = val->u.u!=0; break;
+        case kIntTFl:    valRef = val->u.i!=0; break;
+        case kFloatTFl:  valRef = val->u.f!=0; break;
+        case kDoubleTFl: valRef = val->u.d!=0; break;
+        default:
+          rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to a bool.");
       }
+      return rc;
+    }
+    
+    rc_t _val_get( const value_t* val, uint_t& valRef )
+    {
+      rc_t rc = kOkRC;
+      switch( val->flags & kTypeMask )
+      {
+        case kBoolTFl:   valRef = val->u.b ? 1 : 0; break;
+        case kUIntTFl:   valRef = val->u.u; break;
+        case kIntTFl:    valRef = val->u.i; break;
+        case kFloatTFl:  valRef = (uint_t)val->u.f; break;
+        case kDoubleTFl: valRef = (uint_t)val->u.d; break;
+        default:
+          rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to a uint_t.");
+      }
+      return rc;
+    }
       
-    errLabel:
+    rc_t _val_get( const value_t* val, int_t& valRef )
+    {
+      rc_t rc = kOkRC;
+      switch( val->flags & kTypeMask )
+      {
+        case kBoolTFl:   valRef = val->u.b ? 1 : 0; break;
+        case kUIntTFl:   valRef = (int_t)val->u.u; break;
+        case kIntTFl:    valRef = val->u.i; break;
+        case kFloatTFl:  valRef = (int_t)val->u.f; break;
+        case kDoubleTFl: valRef = (int_t)val->u.d; break;
+        default:
+          rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to a int_t.");
+      }
       return rc;
     }
 
-    
-    variable_t* _var_find( instance_t* inst, const char* label, unsigned chIdx )
+    rc_t _val_get( const value_t* val, float& valRef )
     {
+      rc_t rc = kOkRC;
+      switch( val->flags & kTypeMask )
+      {
+        case kBoolTFl:   valRef = val->u.b ? 1 : 0; break;
+        case kUIntTFl:   valRef = (float)val->u.u; break;
+        case kIntTFl:    valRef = (float)val->u.i; break;
+        case kFloatTFl:  valRef = (float)val->u.f; break;
+        case kDoubleTFl: valRef = (float)val->u.d; break;
+        default:
+          rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to a float.");
+      }
+      return rc;
+    }
+
+    rc_t _val_get( const value_t* val, double& valRef )
+    {
+      rc_t rc = kOkRC;
+      switch( val->flags & kTypeMask )
+      {
+        case kBoolTFl:   valRef = val->u.b ? 1 : 0; break;
+        case kUIntTFl:   valRef = (double)val->u.u; break;
+        case kIntTFl:    valRef = (double)val->u.i; break;
+        case kFloatTFl:  valRef = (double)val->u.f; break;
+        case kDoubleTFl: valRef =         val->u.d; break;
+        default:
+          rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to a double.");
+      }
+      return rc;
+    }
+
+    rc_t _val_get( const value_t* val, const char*& valRef )
+    {
+      rc_t rc = kOkRC;
+      if( cwIsFlag(val->flags & kTypeMask, kStringTFl) )
+        valRef = val->u.s;
+      else
+      {
+        rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to a string.");
+        valRef = nullptr;
+      }
+      
+      return rc;
+    }
+
+    rc_t _val_get( value_t* val, abuf_t*& valRef )
+    {
+      rc_t rc = kOkRC;
+      if( cwIsFlag(val->flags & kTypeMask, kABufTFl) )
+        valRef = val->u.abuf;
+      else
+      {
+        rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to an abuf_t.");
+        valRef = nullptr;
+      }
+      return rc;
+    }
+
+    rc_t _val_get( value_t* val, const abuf_t*& valRef )
+    {
+      abuf_t* non_const_val;
+      rc_t rc = kOkRC;
+      if((rc = _val_get(val,non_const_val)) == kOkRC )
+        valRef = non_const_val;
+      return rc;        
+    }
+
+    rc_t _val_get( value_t* val, fbuf_t*& valRef )
+    {
+      rc_t rc = kOkRC;
+      if( cwIsFlag(val->flags & kTypeMask, kFBufTFl) )
+        valRef = val->u.fbuf;
+      else
+      {
+        valRef = nullptr;
+        rc = cwLogError(kTypeMismatchRC,"The type 0x%x could not be converted to an fbuf_t.");
+      }
+      return rc;
+    }
+
+    rc_t _val_get( value_t* val, const fbuf_t*& valRef )
+    {
+      fbuf_t* non_const_val;
+      rc_t rc = kOkRC;
+      if((rc = _val_get(val,non_const_val)) == kOkRC )
+        valRef = non_const_val;
+      return rc;        
+    }
+    
+
+    rc_t _var_find_to_set( instance_t* inst, unsigned vid, unsigned chIdx, unsigned typeFl, variable_t*& varRef )
+    {
+      rc_t rc = kOkRC;
+      varRef = nullptr;
+
+      // 
+      if((rc = var_find(inst,vid,chIdx,varRef)) == kOkRC )
+      {
+        // validate the type of the variable against the description
+        if( !cwIsFlag(varRef->varDesc->type,typeFl ) )
+          rc = cwLogError(kTypeMismatchRC,"Type mismatch. Instance:%s variable:%s with type 0x%x does not match requested type:0x%x.",varRef->inst->label,varRef->label,varRef->varDesc->type,typeFl);
+    
+      }
+
+      return rc;
+    }
+   
+
+    // Variable lookup: Exact match on vid and chIdx
+    rc_t _var_find_on_vid_and_ch( instance_t* inst, unsigned vid, unsigned chIdx, variable_t*& varRef )
+    {
+      varRef = nullptr;
+      
+      for(variable_t* var = inst->varL; var!=nullptr; var=var->var_link)
+      {
+        // the variable vid and chIdx should form a unique pair
+        if( var->vid==vid && var->chIdx == chIdx )
+        {
+          varRef = var;
+          return kOkRC;
+        }
+      }
+      return cwLogError(kInvalidIdRC,"The variable matching id:%i ch:%i on instance '%s' could not be found.", vid, chIdx, inst->label);
+    }
+
+    // Variable lookup: Exact match on label and chIdx
+    variable_t* _var_find_on_label_and_ch( instance_t* inst, const char* var_label, unsigned chIdx )
+    {
+      for(variable_t* var = inst->varL; var!=nullptr; var=var->var_link)
+      {
+        // the variable vid and chIdx should form a unique pair
+        if( textCompare(var->label,var_label)==0 && var->chIdx == chIdx )
+          return var;
+      }
+      
+      return nullptr;
+    }
+    
+    
+    // Find a variable: If an exact match on label,chIdx is found this is returned.
+    // Otherwise if the arg 'chIdx' is a numeric channel idx the 'any' var is returned.
+    //           if the arg 'chIdx' is 'any' then the 'any' or the lowest numeric channel is returned
+    variable_t* _var_find_best( instance_t* inst, const char* label, unsigned chIdx )
+    {
+      /*
+      variable_t* v0 = nullptr;
       variable_t* var  = inst->varL;
   
-      for(; var!=nullptr; var=var->link)
-        if( textCompare(var->label,label) == 0 && (var->chIdx==chIdx || var->chIdx==kAnyChIdx || (chIdx==kAnyChIdx && var->chIdx==0)))
-          return var;
-      return nullptr;
-  
+      for(; var!=nullptr; var=var->var_link)
+        if( textCompare(var->label,label) == 0 )
+        {
+          // if the channel matches exactly - return this var
+          if( var->chIdx == chIdx )
+            return var;
+
+          // if we encounter a var with 'any' channel - store this we will keep looking because we may still find an exact match
+          if( var->chIdx == kAnyChIdx )
+            v0 = var;
+          else
+            // if 'any' was requested then try to get ch==0 but a non-zero channel will suffice otherwise
+            if( chIdx == kAnyChIdx )
+              if( v0 == nullptr || var->chIdx < v0->chIdx )
+                v0 = var;
+        }
+      
+      return v0;
+      */
+      
+      return _var_find_on_label_and_ch(inst,label,chIdx);
+      
     }
 
     rc_t _validate_var_assignment( variable_t* var, unsigned typeFl )
@@ -189,7 +429,7 @@ namespace cw
       
       if( !cwIsFlag(var->varDesc->type, typeFl ) )
         return cwLogError(kTypeMismatchRC, "The variable '%s' on instance '%s' is not a  '%s'.", var->label, var->inst->label, _typeFlagToLabel( typeFl ));
-      
+
       return kOkRC;
     }
 
@@ -204,6 +444,22 @@ namespace cw
       
       return rc;
     }
+
+    rc_t _var_set( variable_t* var, bool val )
+    {
+      rc_t rc;
+      if((rc = _validate_var_assignment( var, kBoolTFl )) != kOkRC )
+        return rc;
+      
+      _value_release(&var->local_value);
+      var->local_value.u.b   = val;
+      var->local_value.flags = kBoolTFl;
+      var->value             = &var->local_value;
+
+      cwLogMod("%s.%s ch:%i %i (bool).",var->inst->label,var->label,var->chIdx,val);
+
+      return _var_broadcast_new_value( var );        
+    }
     
     rc_t _var_set( variable_t* var, unsigned val )
     {
@@ -212,10 +468,12 @@ namespace cw
         return rc;
       
       _value_release(&var->local_value);
-      var->local_value.u.u = val;
-      var->local_value.flags  = kUIntTFl;
-      var->value = &var->local_value;
+      var->local_value.u.u   = val;
+      var->local_value.flags = kUIntTFl;
+      var->value             = &var->local_value;
 
+      cwLogMod("%s.%s ch:%i %i (uint_t).",var->inst->label,var->label,var->chIdx,val);
+      
       return _var_broadcast_new_value( var );
         
     }
@@ -231,20 +489,56 @@ namespace cw
       var->local_value.flags  = kIntTFl;
       var->value = &var->local_value;
 
+      cwLogMod("%s.%s ch:%i %i (int_t).",var->inst->label,var->label,var->chIdx,val);
+      
       return _var_broadcast_new_value( var );      
     }
     
-    rc_t _var_set( variable_t* var, real_t val )
+    rc_t _var_set( variable_t* var, float val )
     {
       rc_t rc;
-      if((rc = _validate_var_assignment( var, kRealTFl )) != kOkRC )
+      if((rc = _validate_var_assignment( var, kFloatTFl )) != kOkRC )
         return rc;
       
       _value_release(&var->local_value);
-      var->local_value.u.r = val;
-      var->local_value.flags  = kRealTFl;
+      var->local_value.u.f = val;
+      var->local_value.flags  = kFloatTFl;
       var->value = &var->local_value;
 
+      cwLogMod("%s.%s ch:%i %f (float).",var->inst->label,var->label,var->chIdx,val);
+        
+      return _var_broadcast_new_value( var );      
+    }
+
+    rc_t _var_set( variable_t* var, double val )
+    {
+      rc_t rc;
+      if((rc = _validate_var_assignment( var, kDoubleTFl )) != kOkRC )
+        return rc;
+      
+      _value_release(&var->local_value);
+      var->local_value.u.d = val;
+      var->local_value.flags  = kDoubleTFl;
+      var->value = &var->local_value;
+
+      cwLogMod("%s.%s ch:%i %f (double).",var->inst->label,var->label,var->chIdx,val);
+      
+      return _var_broadcast_new_value( var );      
+    }
+    
+    rc_t _var_set( variable_t* var, const char* val )
+    {
+      rc_t rc;
+      if((rc = _validate_var_assignment( var, kStringTFl )) != kOkRC )
+        return rc;
+      
+      _value_release(&var->local_value);
+      var->local_value.u.s = mem::duplStr(val);
+      var->local_value.flags  = kStringTFl;
+      var->value = &var->local_value;
+
+      cwLogMod("%s.%s ch:%i %s (string).",var->inst->label,var->label,var->chIdx,cwStringNullGuard(val));
+      
       return _var_broadcast_new_value( var );      
     }
     
@@ -259,6 +553,8 @@ namespace cw
       var->local_value.flags  = kABufTFl;
       var->value = &var->local_value;
 
+      cwLogMod("%s.%s ch:%i %s (abuf).",var->inst->label,var->label,var->chIdx,abuf==nullptr ? "null" : "valid");
+      
       return _var_broadcast_new_value( var );
       
     }
@@ -273,36 +569,79 @@ namespace cw
       var->local_value.u.fbuf = fbuf;
       var->local_value.flags  = kFBufTFl;
       var->value = &var->local_value;
+
+      cwLogMod("%s.%s ch:%i %s (fbuf).",var->inst->label,var->label,var->chIdx,fbuf==nullptr ? "null" : "valid");
       
       return _var_broadcast_new_value( var );
     }
 
-    const preset_t* _preset_find( class_desc_t* cd, const char* preset_label )
+    template< typename T >
+    rc_t _var_set_driver( variable_t* var, T value )
     {
-      const preset_t* pr;
-      for(pr=cd->presetL; pr!=nullptr; pr=pr->link)
-        if( textCompare(pr->label,preset_label) == 0 )
-          return pr;
+      rc_t rc;
 
-      return nullptr;
+      // if this assignment targets a specific channel ...
+      if( var->chIdx != kAnyChIdx )
+      {
+        rc = _var_set(var,value); // ...  then set it alone
+      }
+      else // ... otherwise set all channels.
+      {
+        for(; var!=nullptr; var=var->ch_link)
+          if((rc = _var_set(var,value)) != kOkRC )
+            break;
+      }
+
+      return rc;
     }
+
+
     
-    rc_t _preset_set_var_value( instance_t* inst, const char* var_label, unsigned chIdx, const object_t* value )
+    rc_t  _var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, abuf_t* abuf )
+    {
+      rc_t rc;
+      variable_t* var = nullptr;
+      if((rc = var_register_and_set( inst, var_label, vid, chIdx, var)) != kOkRC )
+        return rc;
+
+      if( var != nullptr )
+        _var_set_driver( var, abuf );
+
+      return rc;
+    }
+
+    rc_t  _var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, fbuf_t* fbuf )
+    {
+      rc_t rc;
+      variable_t* var = nullptr;
+      if((rc = var_register_and_set( inst, var_label, vid, chIdx, var)) != kOkRC )
+        return rc;
+
+      if( var != nullptr )
+        _var_set_driver( var, fbuf );
+
+      return rc;
+    }
+
+    rc_t _set_var_value_from_cfg( variable_t* var, const object_t* value )
     {
       rc_t rc = kOkRC;
-      variable_t* var = nullptr;
 
-      // get the variable
-      if((rc = var_get( inst, var_label, chIdx, var )) != kOkRC )
-        goto errLabel;
-        
       switch( var->varDesc->type & kTypeMask )
       {
+        case kBoolTFl:
+          {
+            bool v;
+            if((rc = value->value(v)) == kOkRC )
+              rc = _var_set_driver( var, v );
+          }
+          break;
+          
         case kUIntTFl:
           {
             unsigned v;
             if((rc = value->value(v)) == kOkRC )
-              rc = _var_set( var, v );
+              rc = _var_set_driver( var, v );
           }
           break;
           
@@ -310,29 +649,208 @@ namespace cw
           {
             int v;
             if((rc = value->value(v)) == kOkRC )
-              rc = _var_set( var, v );
+              rc = _var_set_driver( var, v );
           }
           break;
           
-        case kRealTFl:
+        case kFloatTFl:
           {
-            real_t v;
+            float v;
             if((rc = value->value(v)) == kOkRC )
-              rc = _var_set( var, v );
+              rc = _var_set_driver( var, v );
+          }
+          break;
+
+        case kDoubleTFl:
+          {
+            double v;
+            if((rc = value->value(v)) == kOkRC )
+              rc = _var_set_driver( var, v );
           }
           break;
           
+        case kStringTFl:
+          {
+            const char* v;
+            if((rc = value->value(v)) == kOkRC )
+              rc = _var_set_driver( var, v );
+          }
+          break;
+
         default:
           rc = cwLogError(kOpFailRC,"The variable type 0x%x cannot yet be set via a preset.", var->varDesc->type );
           goto errLabel;
       }
 
+    errLabel:
+      if( rc != kOkRC )
+        rc = cwLogError(kSyntaxErrorRC,"The %s.%s could not extract a type:%s from a configuration value.",var->inst->label,var->label,_typeFlagToLabel(var->varDesc->type & kTypeMask));
+      return rc;
+      
+    }
+
+    rc_t  _var_map_id_to_index(  instance_t* inst, unsigned vid, unsigned chIdx, unsigned& idxRef )
+    {
+      unsigned idx = vid * inst->varMapChN + (chIdx == kAnyChIdx ? 0 : chIdx);
+
+      // verify that the map idx is valid
+      if( idx >= inst->varMapN )
+        return cwLogError(kAssertFailRC,"The variable map positioning location %i is out of the range % on instance '%s' vid:%i ch:%i.", idx, inst->varMapN, inst->label,vid,chIdx);
+
+      idxRef = idx;
+  
+      return kOkRC;
+    }
+
+    rc_t  _var_map_label_to_index(  instance_t* inst, const char* var_label, unsigned chIdx, unsigned& idxRef )
+    {
+      rc_t        rc  = kOkRC;
+      variable_t* var = nullptr;
+  
+      idxRef = kInvalidIdx;
+      if((rc = var_find(inst, var_label, chIdx, var )) == kOkRC)
+        rc = _var_map_id_to_index( inst, var->vid, chIdx, idxRef );
+     
+      return rc;
+    }
+
+    rc_t _var_add_to_ch_list( instance_t* inst, variable_t* new_var )
+    {
+      rc_t rc = kOkRC;
+      
+      variable_t* base_var = nullptr;
+      variable_t* v0 = nullptr;
+      variable_t* v1 = nullptr;
+      
+      if( new_var->chIdx == kAnyChIdx )
+        return kOkRC;
+      
+      if((base_var = _var_find_on_label_and_ch( inst, new_var->label, kAnyChIdx )) == nullptr )
+      {
+        rc = cwLogError(kInvalidStateRC,"The base channel variable does not exist for '%s.%s'. This is an illegal state.", inst->label, new_var->label );
+        goto errLabel;
+      }
+
+      // insert v0 in order by channel number
+      for(v0=base_var,v1=base_var->ch_link; v1!=nullptr; v1=v1->ch_link)
+      {
+        if( v1->chIdx > new_var->chIdx )
+          break;
+        v0 = v1;
+      }
+
+      // the new var channel index should never match the previous or next channel index
+      assert( v0->chIdx != new_var->chIdx && (v1==nullptr || v1->chIdx != new_var->chIdx ) );
+
+      new_var->ch_link = v1;
+      v0->ch_link      = new_var;
+      
+      
+    errLabel:
+      return rc;
+      
+    }
+
+    // Create a variable and set it's value from 'value_cfg'.
+    // If 'value_cfg' is null then use the value from var->varDesc->val_cfg.
+    rc_t _var_create( instance_t* inst, const char* var_label, unsigned id, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef )
+    {
+      rc_t        rc  = kOkRC;
+      variable_t* var = nullptr;
+      var_desc_t* vd  = nullptr;
+      
+      varRef = nullptr;
+
+      // if this var already exists - it can't be created again
+      if((var = _var_find_on_label_and_ch(inst,var_label,chIdx)) != nullptr )
+      {
+        rc = cwLogError(kInvalidStateRC,"The variable '%s' ch:%i has already been created on the instance: '%s'.",var_label,chIdx,inst->label);
+        goto errLabel;
+      }
+
+      // locate the var desc
+      if((vd = var_desc_find( inst->class_desc, var_label)) == nullptr )
+      {
+        rc = cwLogError(kInvalidIdRC,"Unable to locate the variable '%s' in class '%s'.", var_label, inst->class_desc->label );
+        goto errLabel;
+      }
+
+      // create the var
+      var = mem::allocZ<variable_t>();
+
+      var->varDesc = vd;
+      var->inst    = inst;
+      var->label   = mem::duplStr(var_label);
+      var->vid     = id;
+      var->chIdx   = chIdx;
+      var->value   = nullptr;
+
+      // if no value was given then set the value to the value given in the class
+      if( value_cfg == nullptr )
+        value_cfg = var->varDesc->val_cfg;
+
+      // if value_cfg is valid set the variable value
+      if( value_cfg != nullptr )
+        if((rc = _set_var_value_from_cfg( var, value_cfg )) != kOkRC )
+          goto errLabel;
+
+      var->var_link  = inst->varL;
+      inst->varL = var;
+
+      // link the new var into the ch_link list
+      if((rc = _var_add_to_ch_list(inst, var )) != kOkRC )
+        goto errLabel;
+
+
+    errLabel:
+      if( rc != kOkRC )
+      {
+        _var_destroy(var);
+        cwLogError(kOpFailRC,"Variable creation failed on '%s.%s' ch:%i.", inst->label, var_label, chIdx );
+      }
+      else
+      {
+        varRef = var;
+        cwLogMod("Created var: %s.%s ch:%i.", inst->label, var_label, chIdx );
+      }
+      
+      return rc;
+    }
+
+    void _var_print( const variable_t* var )
+    {
+      const char* local_label = var->value==nullptr || var->value == &var->local_value ? "local" : "     ";
+    
+      printf("  %20s id:%4i ch:%3i : %s  : ", var->label, var->vid, var->chIdx, local_label );
+    
+      if( var->value == nullptr )
+        _value_print( &var->local_value );
+      else
+        _value_print( var->value );
+
+      printf("\n");    
+    }
+    
+    
+    rc_t _preset_set_var_value( instance_t* inst, const char* var_label, unsigned chIdx, const object_t* value )
+    {
+      rc_t rc = kOkRC;
+      variable_t* var = nullptr;
+
+      // get the variable
+      if((rc = var_find( inst, var_label, chIdx, var )) != kOkRC )
+        goto errLabel;
+        
+      rc = _set_var_value_from_cfg( var, value );
+      
     errLabel:
       if( rc != kOkRC )
         rc = cwLogError(rc,"The value of instance:%s variable:%s could not be set via a preset.", inst->label, var_label );
 
       return rc;
     }
+
+
     
   }
 }
@@ -358,6 +876,12 @@ void  cw::flow::abuf_destroy( abuf_t* abuf )
   mem::release(abuf);
 }
 
+cw::flow::abuf_t*  cw::flow::abuf_duplicate( const abuf_t* src )
+{
+  return abuf_create( src->srate, src->chN, src->frameN );
+}
+
+
 cw::rc_t  cw::flow::abuf_set_channel( abuf_t* abuf, unsigned chIdx, const sample_t* v, unsigned vN )
 {
   rc_t rc = kOkRC;
@@ -392,6 +916,7 @@ cw::flow::fbuf_t*  cw::flow::fbuf_create( srate_t srate, unsigned chN, unsigned
   f->magV    = mem::allocZ<sample_t*>(chN);
   f->phsV    = mem::allocZ<sample_t*>(chN);
   f->hzV     = mem::allocZ<sample_t*>(chN);
+  f->readyFlV= mem::allocZ<bool>(chN);
 
   if( magV != nullptr || phsV != nullptr || hzV != nullptr )
   {
@@ -429,9 +954,23 @@ void cw::flow::fbuf_destroy( fbuf_t* fbuf )
   mem::release( fbuf->phsV);
   mem::release( fbuf->hzV);
   mem::release( fbuf->buf);
+  mem::release( fbuf->readyFlV);
   mem::release( fbuf);
 }
 
+cw::flow::fbuf_t*  cw::flow::fbuf_duplicate( const fbuf_t* src )
+{
+  fbuf_t* fbuf = fbuf_create( src->srate, src->chN, src->binN, src->hopSmpN );
+  for(unsigned i=0; i<fbuf->chN; ++i)
+  {
+    vop::copy( fbuf->magV[i], src->magV[i], fbuf->binN );
+    vop::copy( fbuf->phsV[i], src->phsV[i], fbuf->binN );
+    vop::copy( fbuf->hzV[i],  src->hzV[i],  fbuf->binN );    
+  }
+  return fbuf;
+}
+
+
 unsigned cw::flow::value_type_label_to_flag( const char* s )
 {
   unsigned flags = labelToId(typeLabelFlagsA,s,kInvalidTFl);
@@ -468,7 +1007,7 @@ cw::rc_t cw::flow::var_desc_find( class_desc_t* cd, const char* label, var_desc_
 }
 
 
-void cw::flow::class_desc_print( flow_t* p )
+void cw::flow::class_dict_print( flow_t* p )
 {
   for(unsigned i=0; i<p->classDescN; ++i)
   {
@@ -510,75 +1049,156 @@ cw::rc_t cw::flow::instance_find( flow_t* p, const char* inst_label, instance_t*
   return cwLogError(kInvalidArgRC,"The instance '%s' was not found.", inst_label );
 }
 
+
 void cw::flow::instance_print( instance_t* inst )
 {
   printf("%s\n", inst->label);
-  for(variable_t* var = inst->varL; var!=nullptr; var=var->link)
-  {
-    printf("  %20s id:%4i ch:%3i : ", var->label, var->vid, var->chIdx );
-    _value_print( var->value );
-    printf("\n");
-  }
-}
+  for(variable_t* var = inst->varL; var!=nullptr; var=var->var_link)
+    if( var->chIdx == kAnyChIdx )
+      for(variable_t* v0 = var; v0!=nullptr; v0=v0->ch_link)
+        _var_print(v0);      
+  
+  if( inst->class_desc->members->report )
+    inst->class_desc->members->report( inst );
+    
 
-
-cw::rc_t cw::flow::var_create( instance_t* inst, const char* var_label, unsigned id, unsigned chIdx, variable_t*& varRef )
-{
-  rc_t rc = kOkRC;
-  
-  varRef = nullptr;
-  
-  variable_t* var = nullptr;
-
-  // if this var already exists then just update its id
-  if( var_exists(inst,var_label,chIdx) )
-  {
-    rc = cwLogError(kInvalidStateRC,"The variable '%s' has already been created on the instance: '%s'.",var_label,inst->label);
-    goto errLabel;
-  }
-  
-  var = mem::allocZ<variable_t>();
-  
-  if((var->varDesc = var_desc_find( inst->class_desc, var_label)) == nullptr )
-  {
-    rc = cwLogError(kInvalidIdRC,"Unable to locate the variable '%s' in class '%s'.", var_label, inst->class_desc->label );
-    goto errLabel;
-  }
-
-  var->inst  = inst;
-  var->label = mem::duplStr(var_label);
-  var->vid   = id;
-  var->chIdx = chIdx;
-  var->value = nullptr;
-  var->link  = inst->varL;
-  inst->varL = var;
-  
-  
- errLabel:
-
-  if(rc != kOkRC )
-    rc = cwLogError(kOpFailRC,"Creation failed for variable '%s' on instance '%s'.", var_label, inst->label );
-  else
-    varRef = var;
-  
-  return kOkRC;
 }
 
 void cw::flow::_var_destroy( variable_t* var )
 {
-  _value_release(&var->local_value);
-  mem::release(var->label);
-  mem::release(var);
+  if( var != nullptr )
+  {
+    _value_release(&var->local_value);
+    mem::release(var->label);
+    mem::release(var);
+  }
+}
+
+
+cw::rc_t cw::flow::var_create( instance_t* inst, const char* var_label, unsigned id, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef )
+{
+  rc_t rc = kOkRC;
+ 
+  rc = _var_create( inst, var_label, id, chIdx, value_cfg, varRef );
+
+  return rc;
+}
+
+cw::rc_t  cw::flow::var_channelize( instance_t* inst, const char* var_label, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef )
+{
+  rc_t        rc  = kOkRC;
+  variable_t* var = nullptr;
+  variable_t* base_var = nullptr;
+  varRef = nullptr;
+
+  if((base_var = _var_find_on_label_and_ch( inst, var_label, kAnyChIdx)) == nullptr)
+  {
+    rc = cwLogError(kInvalidStateRC,"The base ('any') channel variable could not be located on '%s.%s'.",inst->label,var_label);
+    goto errLabel;
+  }
+
+  
+  // locate the variable with the stated chIdx
+  var = _var_find_on_label_and_ch( inst, var_label, chIdx );
+  
+
+  // 'src' variables cannot be channelized
+  if( cwIsFlag(base_var->varDesc->flags,kSrcVarFl) )
+  {
+    rc = cwLogError(rc,"'src' variables cannot be channelized.");
+    goto errLabel;
+  }
+
+  // if the requested var was not found then create a new variable with the requested channel index
+  if( var == nullptr && chIdx != kAnyChIdx )
+  {
+    // create the channelized var
+    if((rc = _var_create( inst, var_label, kInvalidId, chIdx, value_cfg, var )) != kOkRC )
+      goto errLabel;
+
+    // if no value was set then set the value from the 'any' channel
+    if( value_cfg == nullptr )
+    {
+      // Set the value of the new variable to the value of the 'any' channel
+      _value_duplicate( var->local_value, base_var->local_value );
+
+      // If the 'any' channel value was set to point to it's local value then do same with this value
+      if( &base_var->local_value == base_var->value )
+        var->value = &var->local_value;
+    }
+    
+  }
+  else
+  {
+    
+    // a correctly channelized var was found - but we still may need to set the value
+    if( value_cfg != nullptr )
+    {
+      rc = _set_var_value_from_cfg( var, value_cfg );
+    }
+    else
+    {
+      cwLogWarning("An existing var (%s.%s ch:%i) was specified for channelizing but no value was provided.", inst->label, var_label, chIdx );
+    }
+  }
+
+  assert( var != nullptr );
+  varRef = var;
+  
+ errLabel:
+  if( rc != kOkRC )
+    rc = cwLogError(rc,"Channelize failed for variable '%s' on instance '%s' ch:%i.", var_label, inst->label, chIdx );
+  
+  return rc;
 }
 
 bool cw::flow::var_exists( instance_t* inst, const char* label, unsigned chIdx )
-{ return _var_find(inst,label,chIdx) != nullptr; }
+{ return _var_find_on_label_and_ch(inst,label,chIdx) != nullptr; }
 
-cw::rc_t cw::flow::var_get( instance_t* inst, const char* label, unsigned chIdx, variable_t*& vRef )
+
+cw::rc_t cw::flow::var_find( instance_t* inst, unsigned vid, unsigned chIdx, variable_t*& varRef )
+{
+  rc_t        rc  = kOkRC;
+  unsigned    idx = kInvalidIdx;
+  variable_t* var = nullptr;
+      
+  varRef = nullptr;
+
+  // if the varMapA[] has not yet been formed (we are inside the instance constructor) then do a slow lookup of the variable
+  if( inst->varMapA == nullptr )
+  {
+    if((rc = _var_find_on_vid_and_ch(inst,vid,chIdx,var)) != kOkRC )
+      goto errLabel;
+  }
+  else
+  {
+    // otherwise do a fast lookup using inst->varMapA[]
+    if((rc = _var_map_id_to_index(inst, vid, chIdx, idx )) == kOkRC && (idx != kInvalidIdx ))
+      var = inst->varMapA[idx];
+    else
+    {
+      rc = cwLogError(kInvalidIdRC,"The index of variable vid:%i chIdx:%i on instance '%s' could not be calculated and the variable value could not be retrieved.", vid, chIdx, inst->label);
+      goto errLabel;
+    }
+  }
+
+  // if we get here var must be non-null
+  assert( var != nullptr && rc == kOkRC );
+  varRef = var;
+  
+ errLabel:
+      
+  return rc;
+}
+
+
+
+cw::rc_t cw::flow::var_find( instance_t* inst, const char* label, unsigned chIdx, variable_t*& vRef )
 {
   variable_t* var;
-
-  if((var = _var_find(inst,label,chIdx)) != nullptr )
+  vRef = nullptr;
+  
+  if((var = _var_find_best(inst,label,chIdx)) != nullptr )
   {
     vRef = var;
     return kOkRC;
@@ -587,298 +1207,131 @@ cw::rc_t cw::flow::var_get( instance_t* inst, const char* label, unsigned chIdx,
   return cwLogError(kInvalidIdRC,"The instance '%s' does not have a variable named '%s'.", inst->label, label );  
 }
 
-cw::rc_t cw::flow::var_get( instance_t* inst, const char* label, unsigned chIdx, const variable_t*& vRef )
+cw::rc_t cw::flow::var_find( instance_t* inst, const char* label, unsigned chIdx, const variable_t*& vRef )
 {
   variable_t* v = nullptr;
-  rc_t rc = var_get(inst,label,chIdx,v);
+  rc_t        rc = var_find(inst,label,chIdx,v);
   vRef = v;
   return rc;
 }
 
-cw::rc_t cw::flow::value_get(    instance_t* inst, const char* label, unsigned chIdx, value_t*& vRef )
-{
-  variable_t* var = nullptr;
-  rc_t rc = kOkRC;
-  if((rc = var_get( inst, label, chIdx, var )) != kOkRC )
-    return rc;
-
-  vRef = var->value;
-  return rc;
-}
-
-cw::rc_t cw::flow::value_get(    instance_t* inst, const char* label, unsigned chIdx, const value_t*& vRef )
-{
-  value_t* v = nullptr;
-  rc_t rc = value_get( inst, label, chIdx, v );
-  vRef = v;
-  return rc;
-}
-
-cw::rc_t        cw::flow::var_abuf_create( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned frameN )
-{
-  rc_t        rc;
-  abuf_t*     abuf = nullptr;
-  variable_t* var = nullptr;
-  
-  if((rc = var_create( inst, var_label, vid, chIdx, var)) != kOkRC )
-    return rc;
-      
-  if((abuf = abuf_create( srate, chN, frameN )) == nullptr )
-    return cwLogError(kOpFailRC,"abuf create failed on instance:'%s' variable:'%s'.", inst->label, var_label);
-
-  rc = _var_set( var, abuf );
-  
-  return rc;
-}
-
-cw::rc_t cw::flow::var_fbuf_create( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned binN, unsigned hopSmpN, const sample_t** magV, const sample_t** phsV, const sample_t** hzV )
-{
-  rc_t        rc;
-  fbuf_t*     fbuf = nullptr;
-  variable_t* var = nullptr;
-  
-  if((rc = var_create( inst, var_label, vid, chIdx, var)) != kOkRC )
-    return rc;
-      
-  if((fbuf = fbuf_create( srate, chN, binN, hopSmpN, magV, phsV, hzV )) == nullptr )
-    return cwLogError(kOpFailRC,"fbuf create failed on instance:'%s' variable:'%s'.", inst->label, var_label);
-
-  rc = _var_set( var, fbuf );
-  
-  return rc;
-}
-
-cw::rc_t cw::flow::var_abuf_get( instance_t* inst, const char* var_label, unsigned chIdx, abuf_t*& abufRef )
-{
-  rc_t rc = kOkRC;
-  value_t* val;
-  if((rc = value_get(inst,var_label,chIdx,val)) != kOkRC )
-    goto errLabel;
-
-  if( !value_is_abuf(val))
-  {
-    rc = cwLogError(kTypeMismatchRC,"The variable '%' on instance '%s' is not an abuf.");
-    goto errLabel;
-  }
-  
- errLabel:
-  if( rc == kOkRC )
-    abufRef = val->u.abuf;
-  else
-    rc = cwLogError(rc,"No abuf was retrieved from variable: '%s' instance: '%s'", var_label, inst->label );
-  
-  return rc;  
-}
-
-cw::rc_t cw::flow::var_abuf_get( instance_t* inst, const char* var_label, unsigned chIdx, const abuf_t*& abufRef )
-{
-  rc_t rc;
-  abuf_t* abuf;
-  abufRef = (rc = var_abuf_get( inst, var_label, chIdx, abuf)) == kOkRC ? abuf : nullptr;
-  return rc;
-}
-
-cw::rc_t cw::flow::var_fbuf_get( instance_t* inst, const char* var_label, unsigned chIdx, fbuf_t*& fbufRef )
-{
-  rc_t rc = kOkRC;
-  value_t* val;
-  if((rc = value_get(inst,var_label,chIdx,val)) != kOkRC )
-    goto errLabel;
-
-  if( !value_is_fbuf(val))
-  {
-    rc = cwLogError(kTypeMismatchRC,"The variable '%' on instance '%s' is not an fbuf.");
-    goto errLabel;
-  }
-  
- errLabel:
-  if( rc == kOkRC )
-    fbufRef = val->u.fbuf;
-  else
-    rc = cwLogError(rc,"No fbuf was retrieved from variable: '%s' instance: '%s'", var_label, inst->label );
-  
-  return rc;    
-}
-
-cw::rc_t cw::flow::var_fbuf_get( instance_t* inst, const char* var_label, unsigned chIdx, const fbuf_t*& fbufRef )
-{
-  rc_t rc;
-  fbuf_t* fbuf;
-  fbufRef = (rc = var_fbuf_get( inst, var_label, chIdx, fbuf)) == kOkRC ? fbuf : nullptr;
-  return rc;
-}
-
-cw::rc_t cw::flow::var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, variable_t*& varRef )
+
+cw::rc_t cw::flow::var_register( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef )
 {
+  rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
 
   varRef = nullptr;
 
-  // if the variable already exists then update the vid, and set the returned variable to null.
-  if((var = _var_find(inst,var_label,chIdx)) != nullptr)
+  // TODO: check for duplicate 'vid'-'chIdx' pairs on this instance
+  // The concatenation of 'vid' and 'chIdx' should be unique 
+
+  // if an exact match to label/chIdx was found
+  if((var = _var_find_on_label_and_ch(inst,var_label,chIdx)) != nullptr )
   {
-    var->vid = vid;
-    return kOkRC;  // NOTE: when returning here 'varRef' should be NULL
+    // if a value was given - then update the value
+    if( value_cfg != nullptr )
+      if((rc = _set_var_value_from_cfg( var, value_cfg )) != kOkRC )
+        goto errLabel;    
   }
+  else // an exact match was not found - channelize the variable
+  {
+    if((rc = var_channelize(inst,var_label,chIdx,value_cfg,var)) != kOkRC )
+      goto errLabel;
+  }
+
+  var->vid = vid;
+  varRef   = var;
+  
+ errLabel:
+  if( rc != kOkRC )
+    rc = cwLogError(rc,"Registration failed on variable '%s' instance '%s' ch: %i.", var_label, inst->label, chIdx);
   
-  return var_create( inst, var_label, vid, chIdx, varRef);
-}
-
-cw::rc_t  cw::flow::var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, unsigned value )
-{
-  rc_t rc;
-  variable_t* var = nullptr;
-  if((rc = var_init( inst, var_label, vid, chIdx, var)) != kOkRC )
-    return rc;
-
-  if( var != nullptr )
-    _var_set( var, value );
-
   return rc;
 }
 
-cw::rc_t  cw::flow::var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, int value )
+
+cw::rc_t cw::flow::var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, variable_t*& varRef )
 {
-  rc_t rc;
-  variable_t* var = nullptr;
-  if((rc = var_init( inst, var_label, vid, chIdx, var)) != kOkRC )
-    return rc;
-
-  if( var != nullptr )
-    _var_set( var, value );
-
-  return rc;
+  return var_register( inst, var_label, vid, chIdx, nullptr, varRef );
 }
 
-cw::rc_t  cw::flow::var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, real_t value )
-{
-  rc_t rc;
-  variable_t* var = nullptr;
-  if((rc = var_init( inst, var_label, vid, chIdx, var)) != kOkRC )
-    return rc;
-
-  if( var != nullptr )
-    _var_set( var, value );
-
-  return rc;
-}
-
-cw::rc_t  cw::flow::var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const abuf_t* abuf )
+cw::rc_t        cw::flow::var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned frameN )
 {
   rc_t rc = kOkRC;
-  variable_t* var;
-
-  if((var =  _var_find(inst,var_label,chIdx)) != nullptr )
-    var->vid = vid;
-  else
-    rc = var_abuf_create(inst, var_label, vid, chIdx, abuf->srate, abuf->chN, abuf->frameN );
-
-  return rc;
-}
-
-cw::rc_t  cw::flow::var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const fbuf_t* fbuf )
-{
-  rc_t        rc = kOkRC;
-  variable_t* var;
-  if((var    = _var_find(inst,var_label,chIdx)) != nullptr )
-    var->vid = vid;
-  else
-    rc = var_fbuf_create(inst, var_label, vid, chIdx, fbuf->srate, fbuf->chN, fbuf->binN, fbuf->hopSmpN );
-
-  return rc;
-}
-
-cw::rc_t  cw::flow::var_map_id_to_index(  instance_t* inst, unsigned vid, unsigned chIdx, unsigned& idxRef )
-{
-  unsigned idx = vid * inst->varMapChN + (chIdx == kAnyChIdx ? 0 : chIdx);
-
-  // verify that the map idx is valid
-  if( idx >= inst->varMapN )
-    return cwLogError(kAssertFailRC,"The variable map positioning location %i is out of the range % on instance '%s' vid:%i ch:%i.", idx, inst->varMapN, inst->label,vid,chIdx);
-
-  idxRef = idx;
+  abuf_t* abuf;
   
-  return kOkRC;
+  if((abuf = abuf_create( srate, chN, frameN )) == nullptr )
+    return cwLogError(kOpFailRC,"abuf create failed on instance:'%s' variable:'%s'.", inst->label, var_label);
+
+  if((rc = _var_register_and_set( inst, var_label, vid, chIdx, abuf )) != kOkRC )
+    abuf_destroy(abuf);
+
+  return rc;
 }
 
-cw::rc_t  cw::flow::var_map_label_to_index(  instance_t* inst, const char* var_label, unsigned chIdx, unsigned& idxRef )
+cw::rc_t cw::flow::var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned binN, unsigned hopSmpN, const sample_t** magV, const sample_t** phsV, const sample_t** hzV )
+{
+  rc_t rc = kOkRC;
+  fbuf_t* fbuf;
+  if((fbuf = fbuf_create( srate, chN, binN, hopSmpN, magV, phsV, hzV )) == nullptr )
+    return cwLogError(kOpFailRC,"fbuf create failed on instance:'%s' variable:'%s'.", inst->label, var_label);
+
+  if((rc = _var_register_and_set( inst, var_label, vid, chIdx, fbuf )) != kOkRC )
+    fbuf_destroy(fbuf);
+
+  return rc;
+}
+
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, bool& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, uint_t& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, int_t& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, float& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, double& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, const char*& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, const abuf_t*& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( variable_t* var, abuf_t*& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( const variable_t* var, const fbuf_t*& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t  cw::flow::var_get( variable_t* var, fbuf_t*& valRef )
+{ return _val_get(var->value,valRef); }
+
+cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, bool val )
 {
   rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
   
-  idxRef = kInvalidIdx;
-  if((rc = var_get(inst, var_label, chIdx, var )) == kOkRC)
-     rc = var_map_id_to_index( inst, var->vid, chIdx, idxRef );
-     
-  return rc;
+  if((rc = _var_find_to_set(inst, vid, chIdx, kBoolTFl, var )) == kOkRC )
+    _var_set_driver( var, val );
+  
+  return rc;    
 }
 
-
-cw::rc_t cw::flow::var_get( instance_t* inst, unsigned vid, unsigned chIdx, uint_t& valRef )
-{
-  rc_t        rc  = kOkRC;
-  variable_t* var = nullptr;
-  
-  if((rc = _var_get(inst, vid, chIdx, kUIntTFl, "uint_t", var )) != kOkRC )
-    return rc;
-  
-  valRef = var->value->u.u;
-
-  return rc;
-}
-
-cw::rc_t cw::flow::var_get( instance_t* inst, unsigned vid, unsigned chIdx, int_t& valRef )
-{
-  rc_t        rc  = kOkRC;
-  variable_t* var = nullptr;
-  
-  if((rc = _var_get(inst, vid, chIdx, kIntTFl, "int_t", var )) == kOkRC )
-    valRef = var->value->u.i;
-
-  return rc;
-} 
-
-cw::rc_t cw::flow::var_get( instance_t* inst, unsigned vid, unsigned chIdx, real_t& valRef )
-{
-  rc_t        rc  = kOkRC;
-  variable_t* var = nullptr;
-  
-  if((rc = _var_get(inst, vid, chIdx, kRealTFl, "real_t", var )) == kOkRC )
-    valRef = var->value->u.r;
-  
-  return rc;
-}
-
-cw::rc_t cw::flow::var_get( instance_t* inst, unsigned vid, unsigned chIdx, abuf_t*& valRef )    
-{
-  rc_t        rc  = kOkRC;
-  variable_t* var = nullptr;
-  
-  if((rc = _var_get(inst, vid, chIdx, kABufTFl, "abuf_t", var )) == kOkRC )
-    valRef = var->value->u.abuf;
-  
-  return rc;
-}
-
-cw::rc_t cw::flow::var_get( instance_t* inst, unsigned vid, unsigned chIdx, fbuf_t*& valRef )
-{
-  rc_t        rc  = kOkRC;
-  variable_t* var = nullptr;
-  
-  if((rc = _var_get(inst, vid, chIdx, kFBufTFl, "fbuf_t", var )) == kOkRC )
-    valRef = var->value->u.fbuf;
-  
-  return rc;  
-}
-
-
 cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, uint_t val )
 {
   rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
   
-  if((rc = _var_get(inst, vid, chIdx, kUIntTFl, "uint_t", var )) == kOkRC )
-    _var_set( var, val );
+  if((rc = _var_find_to_set(inst, vid, chIdx, kUIntTFl, var )) == kOkRC )
+    _var_set_driver( var, val );
   
   return rc;    
 }
@@ -888,132 +1341,52 @@ cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, int_
   rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
   
-  if((rc = _var_get(inst, vid, chIdx, kIntTFl, "int_t", var )) == kOkRC )
-    _var_set( var, val );
+  if((rc = _var_find_to_set(inst, vid, chIdx, kIntTFl, var )) == kOkRC )
+    _var_set_driver( var, val );
   
   return rc;    
 }
 
-cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, real_t val )
+cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, float val )
 {
   rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
   
-  if((rc = _var_get(inst, vid, chIdx, kRealTFl, "real_t", var )) == kOkRC )
-    _var_set( var, val );
+  if((rc = _var_find_to_set(inst, vid, chIdx, kFloatTFl, var )) == kOkRC )
+    _var_set_driver( var, val );
   
   return rc;    
 }
 
-
-cw::rc_t   cw::flow::var_set( instance_t* inst, const char* var_label, unsigned chIdx, uint_t val )
+cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, double val )
 {
   rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
-
-  if((rc = var_get(inst, var_label, chIdx, var)) == kOkRC )
-    rc = var_set( inst, var->vid, chIdx, val );
-  return rc;
+  
+  if((rc = _var_find_to_set(inst, vid, chIdx, kDoubleTFl, var )) == kOkRC )
+    _var_set_driver( var, val );
+  
+  return rc;    
 }
 
-cw::rc_t   cw::flow::var_set( instance_t* inst, const char* var_label, unsigned chIdx, int_t val )
+cw::rc_t cw::flow::var_set( instance_t* inst, unsigned vid, unsigned chIdx, const char* val )
 {
   rc_t        rc  = kOkRC;
   variable_t* var = nullptr;
-
-  if((rc = var_get(inst, var_label, chIdx, var)) == kOkRC )
-    rc = var_set( inst, var->vid, chIdx, val );
-  return rc;
+  
+  if((rc = _var_find_to_set(inst, vid, chIdx, kStringTFl, var )) == kOkRC )
+    _var_set_driver( var, val );
+  
+  return rc;    
 }
 
-cw::rc_t   cw::flow::var_set( instance_t* inst, const char* var_label, unsigned chIdx, real_t val )
+const cw::flow::preset_t* cw::flow::class_preset_find( class_desc_t* cd, const char* preset_label )
 {
-  rc_t        rc  = kOkRC;
-  variable_t* var = nullptr;
-
-  if((rc = var_get(inst, var_label, chIdx, var)) == kOkRC )
-    rc = var_set( inst, var->vid, chIdx, val );
-  return rc;
-}
-
-
-cw::rc_t  cw::flow::apply_preset( instance_t* inst, const char* preset_label )
-{
-  rc_t            rc = kOkRC;
   const preset_t* pr;
-
-  // locate the requestd preset record
-  if((pr = _preset_find(inst->class_desc, preset_label)) == nullptr )
-  {
-    rc = cwLogError(kInvalidIdRC,"The preset '%s' could not be found for the instance '%s'.", preset_label, inst->label);
-    goto errLabel;
-  }
-
-  // validate the syntax of the preset record
-  if( !pr->cfg->is_dict() )
-  {
-    rc = cwLogError(kSyntaxErrorRC,"The preset record '%s' on class '%s' is not a dictionary.", preset_label, inst->class_desc->label );
-    goto errLabel;
-  }
-
-  // for each variable
-  for(unsigned i=0; i<pr->cfg->child_count(); ++i)
-  {
-    const object_t* value_list  = pr->cfg->child_ele(i)->pair_value();
-    const char*     value_label = pr->cfg->child_ele(i)->pair_label();
-
-    unsigned preset_valueN = value_list->child_count();
-    unsigned inst_chN      = inst->varMapChN;
-
-    if( preset_valueN == 0 )
-      continue;
-
-    enum { kOneToOneAlgoId, kOneToManyAlgoId, kModuloAlgoId, kRepeatLastAlgoId };
-
-    unsigned algo_id = kModuloAlgoId;
-
-    if( preset_valueN == inst_chN )
-      algo_id = kOneToOneAlgoId;
-    else      
-      if( preset_valueN == 1 && inst_chN >= 1 )
-        algo_id = kOneToManyAlgoId;
-      else
-        algo_id = kModuloAlgoId;
-
-    // for each value in this variables value list/ each var channel on the inst
-    for(unsigned chIdx=0; chIdx<inst->varMapChN; ++chIdx)
-    {
-      if( var_exists( inst, value_label, chIdx ) )
-      {
-        unsigned value_list_idx = 0;
-        
-        switch( algo_id )
-        {
-          case kOneToOneAlgoId:
-            value_list_idx = chIdx;
-            break;
-            
-          case kOneToManyAlgoId:
-            value_list_idx = 0;
-            break;
-            
-          case kModuloAlgoId:
-            value_list_idx = chIdx % value_list->child_count();
-            break;
-            
-          default:
-            assert(0);
-        }
-
-        // set the value of the preset
-        if((rc = _preset_set_var_value( inst, value_label, chIdx, value_list->child_ele(value_list_idx) )) != kOkRC)
-          break;
-        
-      } // if exitst
-    } // for varMapN
-  } // for value_list
-
- errLabel:
+  for(pr=cd->presetL; pr!=nullptr; pr=pr->link)
+    if( textCompare(pr->label,preset_label) == 0 )
+      return pr;
   
-  return rc;
+  return nullptr;
 }
+
diff --git a/cwFlowTypes.h b/cwFlowTypes.h
index e9dbb1b..f649a86 100644
--- a/cwFlowTypes.h
+++ b/cwFlowTypes.h
@@ -3,12 +3,14 @@ namespace cw
   namespace flow
   {
 
-    typedef float    real_t;
-    typedef real_t   sample_t;
-    typedef real_t   srate_t;
-    typedef unsigned uint_t;
-    typedef int      int_t;
-
+    #define kRealTFl kFloatTFl
+    typedef dsp::real_t   real_t;
+    typedef dsp::sample_t sample_t;
+    typedef dsp::srate_t  srate_t;
+    typedef unsigned      uint_t;
+    typedef int           int_t;
+    
+    
     typedef unsigned vid_t;
 
     typedef struct abuf_str
@@ -37,6 +39,7 @@ namespace cw
       sample_t**        magV;    // magV[ chN ][ binN ]
       sample_t**        phsV;    // phsV[ chN ][ binN ]
       sample_t**        hzV;     // hzV[ chN ][ binN ]
+      bool*             readyFlV;// readyFlV[chN] true if this channel is ready to be processed (used to sync. fbuf rate to abuf rate)
       sample_t*         buf;     // memory used by this buffer (or NULL if magV,phsV,hzV point are proxied to another buffer)      
     } fbuf_t;
 
@@ -46,24 +49,22 @@ namespace cw
       kBoolTFl    = 0x00000001,
       kUIntTFl    = 0x00000002,
       kIntTFl     = 0x00000004,
-      kRealTFl    = 0x00000008,
-      kF32TFl     = 0x00000010,
-      kF64TFl     = 0x00000020,
+      kFloatTFl   = 0x00000008,
+      kDoubleTFl  = 0x00000010,
       
-      kBoolMtxTFl = 0x00000040,
-      kUIntMtxTFl = 0x00000080,
-      kIntMtxTFl  = 0x00000100,
-      kRealMtxTFl = 0x00000200,
-      kF32MtxTFl  = 0x00000400,
-      kF64MtxTFl  = 0x00000800,
+      kBoolMtxTFl = 0x00000020,
+      kUIntMtxTFl = 0x00000040,
+      kIntMtxTFl  = 0x00000080,
+      kRealMtxTFl = 0x00000100,
+      kFloatMtxTFl = 0x00000200,
+      kDoubleMtxTFl= 0x00000400,
       
-      kABufTFl    = 0x00001000,
-      kFBufTFl    = 0x00002000,
-      kStringTFl  = 0x00004000,
-      kFNameTFl   = 0x00008000,
-      kTimeTFl    = 0x00010000,
+      kABufTFl    = 0x00000800,
+      kFBufTFl    = 0x00001000,
+      kStringTFl  = 0x00002000,
+      kTimeTFl    = 0x00004000,
 
-      kTypeMask   = 0x0001ffff,
+      kTypeMask   = 0x00007fff,
 
     };
 
@@ -85,7 +86,6 @@ namespace cw
         bool      b;
         uint_t    u;
         int_t     i;
-        real_t    r;
         float     f;
         double    d;
 
@@ -97,20 +97,19 @@ namespace cw
         char*     s;
         char*     fname;
 
-        struct value_str* proxy;
       } u;
       
       struct value_str* link;
       
     } value_t;
 
+
+    inline bool is_numeric( const value_t* v ) { return cwIsFlag(v->flags,kBoolTFl|kUIntTFl|kIntTFl|kFloatTFl|kDoubleTFl); }
+    inline bool is_matrix(  const value_t* v ) { return cwIsFlag(v->flags,kBoolMtxTFl|kUIntMtxTFl|kIntMtxTFl|kFloatMtxTFl|kDoubleMtxTFl); }
+        
     struct instance_str;
     struct variable_str;
-    
-    typedef struct ctx_str
-    {
-    } ctx_t;
-    
+        
     typedef rc_t (*member_func_t)( struct instance_str* ctx );
     typedef rc_t (*member_value_func_t)( struct instance_str* ctx, struct variable_str* var );
     enum
@@ -124,16 +123,18 @@ namespace cw
       member_func_t       destroy;  
       member_value_func_t value;
       member_func_t       exec;
+      member_func_t       report;
     } class_members_t;
     
     typedef struct var_desc_str
     {
-      const object_t*      cfg;     //
-      const char*          label;   //
-      unsigned             type;    // value type id
-      unsigned             flags;   // 
-      const char*          docText; //
-      struct var_desc_str* link;    //
+      const object_t*      cfg;     // The cfg object that describes this variable from 'flow_class'.
+      const object_t*      val_cfg; // An object containing the default value for this variable.
+      const char*          label;   // Name of this var. 
+      unsigned             type;    // Value type id (e.g. kBoolTFl, kIntTFl, ...)
+      unsigned             flags;   // Attributes for this var. (e.g. kSrcVarFl )
+      const char*          docText; // User help string for this var.
+      struct var_desc_str* link;    // class_desc->varDescL list link
     } var_desc_t;
 
     typedef struct preset_str
@@ -152,7 +153,9 @@ namespace cw
       class_members_t*  members;   // member functions for this class
     } class_desc_t;
 
-    
+
+    // Note: The concatenation of 'vid' and 'chIdx' should form a unique identifier among all variables
+    // on a given 'instance'.
     typedef struct variable_str
     {
       struct instance_str* inst;         // pointer to this variables instance
@@ -162,8 +165,9 @@ namespace cw
       value_t              local_value;  // the local value instance (actual value if this is not a 'src' variable)
       value_t*             value;        // pointer to the value associated with this variable   
       unsigned             chIdx;        // channel index
-      struct variable_str* link;         // link to other var's on 'inst' 
+      struct variable_str* var_link;     // link to other var's on 'inst' 
       struct variable_str* connect_link; // list of outgoing connections
+      struct variable_str* ch_link;      // list of channels that share this variable (rooted on 'any' channel - in order by channel number)
     } variable_t;
 
     
@@ -178,7 +182,6 @@ namespace cw
       
       const char*     arg_label;     // optional args label
       const object_t* arg_cfg;       // optional args configuration
-      const char*     preset_label;  // optional preset label
 
       void*           userPtr;       // instance state
 
@@ -214,11 +217,13 @@ namespace cw
     
     abuf_t*         abuf_create( srate_t srate, unsigned chN, unsigned frameN );
     void            abuf_destroy( abuf_t* buf );
+    abuf_t*         abuf_duplicate( const abuf_t* src );
     rc_t            abuf_set_channel( abuf_t* buf, unsigned chIdx, const sample_t* v, unsigned vN );
     const sample_t* abuf_get_channel( abuf_t* buf, unsigned chIdx );
 
     fbuf_t*        fbuf_create( srate_t srate, unsigned chN, unsigned binN, unsigned hopSmpN, const sample_t** magV=nullptr, const sample_t** phsV=nullptr, const sample_t** hzV=nullptr );
     void           fbuf_destroy( fbuf_t* buf );
+    fbuf_t*        fbuf_duplicate( const fbuf_t* src );
     
     inline bool    value_is_abuf( const value_t* v ) { return v->flags & kABufTFl; }
     inline bool    value_is_fbuf( const value_t* v ) { return v->flags & kFBufTFl; }
@@ -233,8 +238,15 @@ namespace cw
     var_desc_t*    var_desc_find( class_desc_t* cd, const char* var_label );
     rc_t           var_desc_find( class_desc_t* cd, const char* label, var_desc_t*& vdRef );
 
-    class_desc_t*  class_desc_find(  flow_t* p, const char* class_desc_label );    
-    void           class_desc_print( flow_t* p );
+    class_desc_t*  class_desc_find(  flow_t* p, const char* class_desc_label );
+    
+    void           class_dict_print( flow_t* p );
+
+    
+    //------------------------------------------------------------------------------------------------------------------------
+    //
+    // Network
+    //
     void           network_print(    flow_t* p );
 
     //------------------------------------------------------------------------------------------------------------------------
@@ -252,72 +264,163 @@ namespace cw
     //
 
     // Create a variable but do not assign it a value.  Return a pointer to the new variable.
-    rc_t           var_create( instance_t* inst, const char* label, unsigned vid, unsigned chIdx, variable_t*& varRef );
+    // Note: `value_cfg` is optional. Set it to NULL to ignore
+    rc_t           var_create( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef );
 
-    // var_init().  If the variable has not yet been created then it is created and assigned a value.
-    // If the variable has already been created then 'vid' and the value are updated.
-    // (Note that abuf and fbuf values are not changed by this function only the 'vid' is updated.)
-    rc_t           var_init( instance_t* inst, const char* label,     unsigned vid, unsigned chIdx, variable_t*& varRef );
-    rc_t           var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, unsigned      value );
-    rc_t           var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, int           value );
-    rc_t           var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, real_t        value );
-    rc_t           var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const abuf_t* abuf );
-    rc_t           var_init( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const fbuf_t* fbuf );
+    // Channelizing creates a new var record with an explicit channel index to replace the
+    // automatically generated variable whose channel index is set to  'all'.
+    rc_t           var_channelize( instance_t* inst, const char* var_label, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef );
 
-    inline rc_t _var_init(cw::flow::instance_t* inst, unsigned int ) { return kOkRC; }
+    // `value_cfg` is optional. Set it to NULL to ignore
+    rc_t           var_register( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, const object_t* value_cfg, variable_t*& varRef );
 
-    template< typename T0, typename T1, typename T2, typename... ARGS >
-    rc_t _var_init( instance_t* inst, unsigned chIdx, T0 vid, T1 var_label, T2 val, ARGS&&... args )
+
+    //-----------------
+    //
+    // var_register
+    //
+    
+    inline rc_t _var_reg(cw::flow::instance_t*, unsigned int ) { return kOkRC; }
+    
+    template< typename T0, typename T1,  typename... ARGS >
+    rc_t _var_reg( instance_t* inst, unsigned chIdx, T0 vid, T1 var_label, ARGS&&... args )
     {
       rc_t rc;
-
-      if((rc = var_init( inst, var_label, vid, chIdx, val )) == kOkRC )        
-        rc = _var_init( inst, chIdx, std::forward<ARGS>(args)...);
+      variable_t* dummy = nullptr;
+      if((rc = var_register( inst, var_label, vid, chIdx, nullptr, dummy )) == kOkRC )        
+        if((rc = _var_reg( inst, chIdx, std::forward<ARGS>(args)...)) != kOkRC )
+          return rc;
       return rc;
     }
 
-    // Call var_init() on a list of variables.
+    // Call var_register() on a list of variables.
     template< typename... ARGS >
-    rc_t           var_init( instance_t* inst, unsigned chIdx, unsigned vid, const char* var_label, ARGS&&... args )
-    {  return _var_init( inst, chIdx, vid, var_label, std::forward<ARGS>(args)...); }
+    rc_t           var_register( instance_t* inst, unsigned chIdx, unsigned vid, const char* var_label, ARGS&&... args )
+    {  return _var_reg( inst, chIdx, vid, var_label, std::forward<ARGS>(args)...); }
+
+
+
+    //---------------------
+    //
+    // var_register_and_get
+    //
+
+    inline rc_t _var_register_and_get(cw::flow::instance_t*, unsigned int ) { return kOkRC; }
+
+    template< typename T>
+    rc_t var_register_and_get( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, T& valRef )
+    {
+      rc_t rc;
+      variable_t* var;
+      if((rc = var_register(inst,var_label,vid,chIdx,nullptr,var)) == kOkRC )
+        rc = var_get(var,valRef);
+      return rc;
+    }
+      
     
+    inline rc_t _var_reg_and_get(cw::flow::instance_t*, unsigned int ) { return kOkRC; }
+
+    template< typename T0, typename T1, typename T2, typename... ARGS >
+    rc_t _var_reg_and_get( instance_t* inst, unsigned chIdx, T0 vid, T1 var_label, T2& valRef, ARGS&&... args )
+    {
+      rc_t rc;
+
+      if((rc = var_register_and_get( inst, var_label, vid, chIdx, valRef )) == kOkRC )        
+        if((rc = _var_reg_and_get( inst, chIdx, std::forward<ARGS>(args)...)) != kOkRC )
+          return rc;
+      
+      return rc;
+    }
+
+    // Call var_register_and_get() on a list of variables.
+    template< typename... ARGS >
+    rc_t           var_register_and_get( instance_t* inst, unsigned chIdx, unsigned vid, const char* var_label, ARGS&&... args )
+    {  return _var_reg_and_get( inst, chIdx, vid, var_label, std::forward<ARGS>(args)...); }
+
+
+    
+    //---------------------
+    //
+    // var_register_and_set
+    //
+    
+    // var_register_and_set().  If the variable has not yet been created then it is created and assigned a value.
+    // If the variable has already been created then 'vid' and the value are updated.
+    // (Note that abuf and fbuf values are not changed by this function only the 'vid' is updated.)
+    rc_t           var_register_and_set( instance_t* inst, const char* label,     unsigned vid, unsigned chIdx, variable_t*& varRef );
+    
+    rc_t           var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned frameN );
+    rc_t           var_register_and_set( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned binN, unsigned hopSmpN, const sample_t** magV=nullptr, const sample_t** phsV=nullptr, const sample_t** hzV=nullptr );
+
+    inline rc_t _var_register_and_set(cw::flow::instance_t*, unsigned int ) { return kOkRC; }
+
+    template< typename T0, typename T1, typename T2, typename... ARGS >
+    rc_t _var_register_and_set( instance_t* inst, unsigned chIdx, T0 vid, T1 var_label, T2 val, ARGS&&... args )
+    {
+      rc_t rc;
+
+      variable_t* var = nullptr;
+      if((rc = var_register_and_set( inst, var_label, vid, chIdx, var)) == kOkRC )
+      {
+        var_set( var, val );        
+        if((rc = _var_register_and_set( inst, chIdx, std::forward<ARGS>(args)...)) != kOkRC )
+          return rc;
+      }
+      
+      return rc;
+    }
+
+    // Call var_register_and_set() on a list of variables.
+    template< typename... ARGS >
+    rc_t           var_register_and_set( instance_t* inst, unsigned chIdx, unsigned vid, const char* var_label, ARGS&&... args )
+    {  return _var_register_and_set( inst, chIdx, vid, var_label, std::forward<ARGS>(args)...); }
+
+
+
     void           _var_destroy( variable_t* var );
 
     bool           var_exists( instance_t* inst, const char* label, unsigned chIdx );
     
-    rc_t           var_get(      instance_t* inst, const char* var_label, unsigned chIdx,       variable_t*& vRef );
-    rc_t           var_get(      instance_t* inst, const char* var_label, unsigned chIdx, const variable_t*& vRef );
+    rc_t           var_find( instance_t* inst, const char* var_label, unsigned chIdx, const variable_t*& varRef );
+    rc_t           var_find( instance_t* inst, const char* var_label, unsigned chIdx,       variable_t*& varRef );
+    rc_t           var_find( instance_t* inst, unsigned vid,          unsigned chIdx,       variable_t*& varRef );
     
-    rc_t           value_get(    instance_t* inst, const char* label, unsigned chIdx,       value_t*& vRef );
-    rc_t           value_get(    instance_t* inst, const char* label, unsigned chIdx, const value_t*& vRef );
-
-    rc_t           var_abuf_create( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned frameN );
-    rc_t           var_fbuf_create( instance_t* inst, const char* var_label, unsigned vid, unsigned chIdx, srate_t srate, unsigned chN, unsigned binN, unsigned hopSmpN, const sample_t** magV=nullptr, const sample_t** phsV=nullptr, const sample_t** hzV=nullptr );
+    rc_t           var_get( const variable_t* var, bool&          valRef );
+    rc_t           var_get( const variable_t* var, uint_t&        valRef );
+    rc_t           var_get( const variable_t* var, int_t&         valRef );
+    rc_t           var_get( const variable_t* var, float&         valRef );
+    rc_t           var_get( const variable_t* var, double&        valRef );
+    rc_t           var_get( const variable_t* var, const char*&   valRef );    
+    rc_t           var_get( const variable_t* var, const abuf_t*& valRef );    
+    rc_t           var_get(       variable_t* var, abuf_t*&       valRef );    
+    rc_t           var_get( const variable_t* var, const fbuf_t*& valRef );
+    rc_t           var_get(       variable_t* var, fbuf_t*&       valRef );
     
-    rc_t           var_abuf_get( instance_t* inst, const char* var_label, unsigned chIdx,       abuf_t*& abufRef );
-    rc_t           var_abuf_get( instance_t* inst, const char* var_label, unsigned chIdx, const abuf_t*& abufRef );
-    rc_t           var_fbuf_get( instance_t* inst, const char* var_label, unsigned chIdx,       fbuf_t*& fbufRef );
-    rc_t           var_fbuf_get( instance_t* inst, const char* var_label, unsigned chIdx, const fbuf_t*& fbufRef );
 
-   
-    rc_t           var_map_id_to_index(     instance_t* inst, unsigned vid, unsigned chIdx, unsigned& idxRef );
-    rc_t           var_map_label_to_index(  instance_t* inst, const char* var_label, unsigned chIdx, unsigned& idxRef );
 
-    rc_t           var_get( instance_t* inst, unsigned vid, unsigned chIdx, uint_t& valRef );
-    rc_t           var_get( instance_t* inst, unsigned vid, unsigned chIdx, int_t& valRef );
-    rc_t           var_get( instance_t* inst, unsigned vid, unsigned chIdx, real_t& valRef );
-    rc_t           var_get( instance_t* inst, unsigned vid, unsigned chIdx, abuf_t*& valRef );    
-    rc_t           var_get( instance_t* inst, unsigned vid, unsigned chIdx, fbuf_t*& valRef );
+    template< typename T>
+    rc_t var_get( instance_t* inst, unsigned vid, unsigned chIdx, T& valRef)
+    {
+      rc_t        rc  = kOkRC;
+      variable_t* var = nullptr;
+      
+      if((rc = var_find(inst, vid, chIdx, var )) == kOkRC )
+        rc = var_get(var,valRef);
+      
+      return rc;  
 
+    }
+
+    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, bool val );
     rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, uint_t val );
     rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, int_t val );
-    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, real_t val );
+    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, float val );
+    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, double val );
+    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, const char* val );
+    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, abuf_t* val );
+    rc_t           var_set( instance_t* inst, unsigned vid, unsigned chIdx, fbuf_t* val );
 
-    rc_t           var_set( instance_t* inst, const char* var_label, unsigned chIdx, uint_t val );
-    rc_t           var_set( instance_t* inst, const char* var_label, unsigned chIdx, int_t val );
-    rc_t           var_set( instance_t* inst, const char* var_label, unsigned chIdx, real_t val );
-    
-    rc_t  apply_preset( instance_t* inst, const char* preset_label );
+    const preset_t* class_preset_find( class_desc_t* cd, const char* preset_label );
     
   }
 }
diff --git a/cwLog.h b/cwLog.h
index e782296..ae3bdd5 100644
--- a/cwLog.h
+++ b/cwLog.h
@@ -109,4 +109,26 @@ namespace cw
 #define cwLogFatal( rc,fmt,...)   cwLogFatalH( cw::log::globalHandle(),  (rc), (fmt), ##__VA_ARGS__ )
 
 
+// This log level is intended for debugging individual modules.
+// By defining cwLOG_MODULE prior to cwLog.h in a given module these logging lines will be enabled.
+#ifdef cwLOG_MODULE
+
+#define cwLogVModRC(rc,fmt, vl) cwLogVInfoH( cw::log::globalhandle(), (rc), (fmt), (vl) )
+#define cwLogModRC( rc,fmt,...) cwLogInfoH(  cw::log::globalHandle(), (rc), (fmt), ##__VA_ARGS__ )
+
+#define cwLogVMod(fmt, vl)      cwLogVInfoH( cw::log::globalHandle(), cw::kOkRC, (fmt), (vl) )
+#define cwLogMod( fmt,...)      cwLogInfoH(  cw::log::globalHandle(), cw::kOkRC, (fmt), ##__VA_ARGS__ )
+
+#else
+
+#define cwLogVModRC(rc,fmt, vl)
+#define cwLogModRC( rc,fmt,...)
+
+#define cwLogVMod(fmt, vl)
+#define cwLogMod( fmt,...)
+
+#endif
+
+
+
 #endif