diff --git a/cwAudioDeviceFile.cpp b/cwAudioDeviceFile.cpp
index fea83a4..36a4277 100644
--- a/cwAudioDeviceFile.cpp
+++ b/cwAudioDeviceFile.cpp
@@ -2,11 +2,17 @@
 #include "cwLog.h"
 #include "cwCommonImpl.h"
 #include "cwMem.h"
+#include "cwText.h"
 #include "cwFile.h"
+#include "cwThread.h"
+#include "cwMutex.h"
 #include "cwObject.h"
+#include "cwTime.h"
 #include "cwAudioFile.h"
 #include "cwAudioDeviceDecls.h"
 #include "cwAudioDevice.h"
+#include "cwAudioDeviceFile.h"
+#include "cwVectOps.h"
 
 namespace cw
 {
@@ -24,29 +30,55 @@ namespace cw
         typedef struct dev_str
         {
           char*               label;
-          audioPacket_t       pkt;
-          float*              pktAudioBuf;
+          
+          std::atomic_uint    readyCnt;
           
           unsigned            framesPerCycle;
           double              srate;
 
-          char*               iInFname;
+          cbFunc_t            cbFunc;
+          void*               cbArg;
+          unsigned            cbDevIdx;
+          
+          bool                isStartedFl;
+
+          char*               iFname;
           audiofile::handle_t iFileH;
           unsigned            iFlags;
-
-          char*               oInFname;
+          unsigned            iChCnt;
+          audioPacket_t       iPkt;
+          float*              iPktAudioBuf;
+          unsigned            iCbCnt;
+          float**             iChArray;  // iChArray[2]
+          float*              iChSmpBuf; //
+          unsigned            iErrCnt;   // count of errors
+          unsigned            iFrmCnt;   // count of frames read
+          
+          char*               oFname;
           audiofile::handle_t oFileH;
           unsigned            oFlags;
           unsigned            oChCnt;
           unsigned            oBitsPerSample;
-          
+          audioPacket_t       oPkt;
+          float*              oPktAudioBuf;
+          unsigned            oCbCnt;
+          float**             oChArray;  // oChArray[2]
+          float*              oChSmpBuf; //
+          unsigned            oErrCnt;   // count of errors
+          unsigned            oFrmCnt;   // count of frames written
+                    
           struct dev_str*     link;
         } dev_t;
         
         typedef struct dev_mgr_str
         {
-          driver_t* driver;
-          dev_t*    list;
+          driver_t         driver;
+          dev_t*           list;
+          unsigned         threadTimeOutMs;
+          unsigned         threadCbCnt;
+          thread::handle_t threadH;
+          mutex::handle_t  mutexH;
+          
         } dev_mgr_t;
 
         dev_mgr_t* _handleToPtr( handle_t h )
@@ -57,7 +89,7 @@ namespace cw
 
         dev_t* _labelToDev( dev_mgr_t* p, const char* label )
         {
-          dev_t* d = p->label;
+          dev_t* d = p->list;
           for(; d!=nullptr; d=d->link)
             if( textCompare(d->label,label) == 0 )
               return d;
@@ -68,7 +100,7 @@ namespace cw
         dev_t* _indexToDev( dev_mgr_t* p, unsigned devIdx )
         {
           unsigned i = 0;
-          dev_t*   d = p->dev;
+          dev_t*   d = p->list;
           
           for(; d!=nullptr; d=d->link)
           {
@@ -76,6 +108,8 @@ namespace cw
               return d;
             ++i;
           }
+
+          return nullptr;
         }
 
         rc_t _indexToDev( dev_mgr_t* p, unsigned devIdx, dev_t*& devPtrRef )
@@ -97,88 +131,308 @@ namespace cw
           d = mem::allocZ<dev_t>();
           d->label = mem::duplStr(label);
 
-          if(d0 == nullptr)
+          if(p->list == nullptr)
             p->list = d;
           else
+          {
+            // set d0 to the last dev on the list
+            dev_t* d0 = p->list;
+            while( d0->link != nullptr )
+              d0 = d0->link;
+            
             d0->link = d;
+          }
           
           return d;          
         }
 
+        void _devReport( dev_t* d )
+        {
+          cwLogInfo("%s : FpC:%i sr:%f",cwStringNullGuard(d->label),d->framesPerCycle,d->srate);
+          
+          if( d->iFileH.isValid() )
+            cwLogInfo(" in:  flags:0x%x ch:%i sr:%f : %s", d->iFlags,channelCount(d->iFileH),sampleRate(d->iFileH),cwStringNullGuard(d->iFname));
+          
+          if( d->oFileH.isValid() )
+            cwLogInfo(" out: flags:0x%x ch:%i sr:%f : %s", d->oFlags,d->oChCnt,d->srate,cwStringNullGuard(d->oFname));
+        }
+
         void _close_input( dev_t* d )
         {
           if( d->iFileH.isValid() )
           {
             close(d->iFileH);
-            d->israte = 0;
-            d->iFramesPerCycle = 0;
+            d->iCbCnt = 0;
+            mem::release(d->iFname);
+            mem::release(d->iPktAudioBuf);
+            mem::release(d->iChArray);
+            mem::release(d->iChSmpBuf);
           }
         }
 
-        rc_t _open_input( dev_t* d )
+        rc_t _open_input( dev_t* d, unsigned devIdx )
         {
-          rc_t rc;
+          rc_t rc = kOkRC;
           audiofile::handle_t iFileH;
-          
+          audiofile::info_t info;
+
+          if( d->iFname == nullptr )
+            return rc;
+                      
           // open the requested audio flie
-          if((rc = open( iFileH, audioInFile, &info )) != kOkRC )
+          if((rc = open( iFileH, d->iFname, &info )) != kOkRC )
           {
-            rc = cwLogError(rc,"Audio file device open failed on '%s'.",cwStringNullGuard(audioInFile));
+            rc = cwLogError(rc,"Audio file device open failed on '%s'.",cwStringNullGuard(d->iFname));
             goto errLabel;
           }
 
           // if the device input file is already open - then close it
           if( d->iFileH.isValid() )
           {
-            cwLogWarning("The audio file device '%s' input file '%s' has been closed prior to opening '%s'.",name(d->iFileH),cwStringNullGuard(audioInFile));
+            cwLogWarning("The audio file device '%s' input file '%s' has been closed prior to opening '%s'.",name(d->iFileH),cwStringNullGuard(d->iFname));
             _close_input(d);
           }
+
+          if( info.srate != d->srate )
+            cwLogWarning("The audio file sample rate (%f) does not match device sample rate (%f).",info.srate,d->srate);
+
+          d->iFileH              = iFileH;
+          d->iPktAudioBuf        = mem::resize<sample_t>(d->iPktAudioBuf,d->framesPerCycle*info.chCnt);
+          d->iChArray            = mem::resize<sample_t*>(d->iChArray,info.chCnt);
+          d->iChSmpBuf           = mem::resize<sample_t>(d->iChSmpBuf, d->framesPerCycle*info.chCnt );
+          d->iChCnt              = info.chCnt;
+          d->iErrCnt             = 0;
+          d->iFrmCnt             = 0;
+          d->iPkt.devIdx         = d->cbDevIdx;
+          d->iPkt.begChIdx       = 0;
+          d->iPkt.chCnt          = info.chCnt;
+          d->iPkt.audioFramesCnt = d->framesPerCycle;
+          d->iPkt.bitsPerSample  = sizeof(sample_t);
+          d->iPkt.flags          = kInterleavedApFl | kFloatApFl;
+          d->iPkt.audioBytesPtr  = d->iPktAudioBuf;
+          d->iPkt.cbArg          = d->cbArg;
           
+          for(unsigned i=0; i<d->iChCnt; ++i)
+            d->iChArray[i] = d->iChSmpBuf + i*d->framesPerCycle;
+          
+        errLabel:
+          return rc;
+        }
+
+        rc_t _read_input( dev_t* d )
+        {
+          rc_t rc = kOkRC;
+
+          unsigned actualFrameCnt = 0;
+          
+          // read the file
+          if((rc = readFloat(d->iFileH, d->framesPerCycle, 0, d->iChCnt, d->iChArray, &actualFrameCnt)) == kOkRC )
+            d->iFrmCnt += actualFrameCnt;
+          else
+          {
+            rc = cwLogError(rc,"File read failed on audio device file: %s.",cwStringNullGuard(d->label));
+            d->iErrCnt += 1;
+            goto errLabel;
+          }
+
+          // interleave into the iPkt audio buffer
+          vop::interleave( d->iPktAudioBuf, d->iChSmpBuf, actualFrameCnt, d->iChCnt );
+
+          if( actualFrameCnt < d->framesPerCycle )
+          {
+            for(unsigned i=0; i<d->iChCnt; ++i)
+              vop::fill( d->iPktAudioBuf + (actualFrameCnt * d->iChCnt) + i, 0, d->framesPerCycle-actualFrameCnt, d->iChCnt );            
+          }
+
+        errLabel:
+          return rc;
         }
-        
 
         void _close_output( dev_t* d )
         {
           if( d->oFileH.isValid() )
           {
             close(d->oFileH);
-            d->osrate = 0;
-            d->oFramesPerCycle = 0;
+            d->oCbCnt = 0;
+            mem::release(d->oFname);
+            mem::release(d->oPktAudioBuf);
+            mem::release(d->oChArray);
+            mem::release(d->oChSmpBuf);
           }
         }
 
-        rc_t _open_output( dev_t* d )
+        rc_t _open_output( dev_t* d, unsigned devIdx )
         {
+          rc_t rc = kOkRC;
           audiofile::handle_t oFileH;
+
+          if( d->oFname == nullptr )
+            return rc;
           
-          // open the requested audio flie
-          if((rc = create( oFileH, audioOutFile, srate, bitsPerSample, chN )) != kOkRC )
+          // open the requested audio output flie
+          if((rc = create( oFileH, d->oFname, d->srate, d->oBitsPerSample, d->oChCnt )) != kOkRC )
           {
-            rc = cwLogError(rc,"Audio file device open failed on '%s'.",cwStringNullGuard(audioInFile));
+            rc = cwLogError(rc,"Audio file device open failed on '%s'.",cwStringNullGuard(d->oFname));
             goto errLabel;
           }
-          
+
+          d->oFileH              = oFileH;
+          d->oPktAudioBuf        = mem::resize<sample_t>(d->oPktAudioBuf,d->framesPerCycle*d->oChCnt);
+          d->oChArray            = mem::resize<sample_t*>(d->oChArray,d->oChCnt);
+          d->oChSmpBuf           = mem::resize<sample_t>(d->oChSmpBuf, d->framesPerCycle*d->oChCnt );
+          d->oFrmCnt             = 0;
+          d->oErrCnt             = 0;
+          d->oPkt.devIdx         = d->cbDevIdx;
+          d->oPkt.begChIdx       = 0;
+          d->oPkt.chCnt          = d->oChCnt;
+          d->oPkt.audioFramesCnt = d->framesPerCycle;
+          d->oPkt.bitsPerSample  = 0;
+          d->oPkt.flags          = kInterleavedApFl | kFloatApFl;
+          d->oPkt.audioBytesPtr  = d->oPktAudioBuf;
+          d->oPkt.cbArg          = d->cbArg;
+
+          for(unsigned i=0; i<d->oChCnt; ++i)
+            d->oChArray[i] = d->oChSmpBuf + i*d->framesPerCycle;
+
+        errLabel:
+          return rc;
         }
-        
+
+        rc_t _write_output( dev_t* d )
+        {
+          rc_t rc = kOkRC;
+
+          if( d->oFileH.isValid() )
+          {
+            /*
+            // deinterleave the audio into d->oChArray[]
+            vop::deinterleave( d->oChSmpBuf, d->oPktAudioBuf, d->framesPerCycle, d->oChCnt );
+
+            // write the audio
+            if((rc = writeFloat( d->oFileH, d->framesPerCycle, d->oChCnt, d->oChArray )) == kOkRC )
+            */
+            
+            if((rc = writeFloatInterleaved( d->oFileH, d->framesPerCycle, d->oChCnt, d->oPktAudioBuf )) == kOkRC )            
+              d->oFrmCnt += d->framesPerCycle;
+            else
+            {
+              rc = cwLogError(rc,"Audio device file write failed on device '%s'.",d->label);
+              d->oErrCnt += 1;
+              goto errLabel;
+            }
+          }
+
+        errLabel:
+          return rc;
+        }
+
+        rc_t _update_device( dev_t* d )
+        {
+          rc_t           rc0   = kOkRC;
+          rc_t           rc1   = kOkRC;
+          
+          audioPacket_t* iPkt  = nullptr;
+          unsigned       iPktN = 0;
+          audioPacket_t* oPkt  = nullptr;
+          unsigned       oPktN = 0;
+          
+          if( d->iFileH.isValid() )
+          {
+            iPkt       = &d->iPkt;
+            iPktN      = 1;
+            d->iCbCnt += 1;
+            rc0        = _read_input( d );    
+          }
+
+          if( d->oFileH.isValid() )
+          {
+            oPkt       = &d->oPkt;
+            oPktN      = 1;
+            d->oCbCnt += 1;
+            vop::zero( d->oPktAudioBuf, d->oChCnt * d->framesPerCycle );
+          }
+  
+          d->cbFunc( d->cbArg, iPkt, iPktN, oPkt, oPktN );
+  
+          if( d->oFileH.isValid() )
+            rc1 = _write_output( d );
+
+          return rcSelect(rc0,rc1);          
+        }
+
+        bool _threadCbFunc( void* arg )
+        {
+          rc_t       rc = kOkRC;
+          dev_mgr_t* p  = (dev_mgr_t*)arg;
+          dev_t*     d  = nullptr;
+          
+          // block on the cond. var - unlock the mutex
+          if((rc = mutex::waitOnCondVar(p->mutexH,false,p->threadTimeOutMs)) != kOkRC )
+          {
+            if( rc != kTimeOutRC )
+            {
+              cwLogError(rc,"Audio device file thread Wait-on-condition-var failed.");
+              return false;
+            }
+          }
+
+          p->threadCbCnt += 1;
+
+          // if the cond. var was signaled and p->mutexH is locked
+          if( rc == kOkRC )
+          {
+            // check for ready devices
+            for(d=p->list; d!=nullptr; d=d->link)
+            {
+              // if this device is ready
+              if( std::atomic_load_explicit(&d->readyCnt, std::memory_order_acquire) > 0  ) // ACQUIRE
+              {
+                // atomic incr  - note that the ordering doesn't matter because the update does not control access to any other variables from another thread
+                std::atomic_store_explicit(&d->readyCnt, d->readyCnt-1,  std::memory_order_relaxed); // decrement
+
+                if((rc = _update_device(d)) != kOkRC )
+                  cwLogError(rc,"The update of audio device file %s failed.",cwStringNullGuard(d->label));
+              
+              }
+            }
+          }
+          return true;
+        }
+
+                
         rc_t _destroy( dev_mgr_t* p )
         {
           rc_t rc = kOkRC;
-          dev_t* d = p->list;
-          while( d != nullptr )
+
+          // destroy the thread
+          if((rc = thread::destroy(p->threadH)) != kOkRC )
+          {
+            rc = cwLogError(rc,"Audio file device thread destroy failed.");
+            goto errLabel;
+          }
+          
+          // destroy the mutex
+          if((rc = mutex::destroy( p->mutexH )) != kOkRC )
+          {
+            rc = cwLogError(rc,"Audio file device thread mutex destroy failed.");
+            goto errLabel;
+          }
+          
+          // destroy each device          
+          for(dev_t* d = p->list; d != nullptr; )
           {
             dev_t* d0 = d->link;
             _close_input(d);
             _close_output(d);
             mem::release(d->label);
             mem::release(d);
-            d = d0;
             
-          }          
+            d = d0;            
+          }
+
+        errLabel:          
           return rc;
         }
-
-        
-        
       }
     }
   }
@@ -203,12 +457,32 @@ cw::rc_t    cw::audio::device::file::create( handle_t& hRef, struct driver_str*&
   p->driver.deviceStart          = deviceStart;
   p->driver.deviceStop           = deviceStop;
   p->driver.deviceIsStarted      = deviceIsStarted;
+  p->driver.deviceIsAsync        = deviceIsAsync;
+  p->driver.deviceExecute        = deviceExecute;
   p->driver.deviceRealTimeReport = deviceRealTimeReport;
+
+  if((rc = create( p->threadH, _threadCbFunc, p )) != kOkRC )
+  {
+    rc = cwLogError(rc,"Audio device file thread create failed.");
+    goto errLabel;
+  }
+
+  // create the audio group thread mutex/cond var
+  if((rc = mutex::create(p->mutexH)) != kOkRC )
+  {
+    rc = cwLogError(rc,"Audio device file mutex create failed.");
+    goto errLabel;
+  }
+
   
   drvRef = &p->driver;
 
   hRef.set(p);
 
+ errLabel:
+  if( rc != kOkRC )
+    rc = cwLogError(rc,"Audio device file create failed.");
+  
   return rc;
 }
   
@@ -223,15 +497,50 @@ cw::rc_t    cw::audio::device::file::destroy( handle_t& hRef )
   if((rc = _destroy(p)) != kOkRC )
     return rc;
 
-  h.clear();
+  hRef.clear();
 
   return rc;  
 }
 
+cw::rc_t   cw::audio::device::file::start( handle_t h )
+{
+  rc_t       rc = kOkRC;
+  dev_mgr_t* p  = _handleToPtr(h);
+
+  // if there are any audio device files
+  if( p->list != nullptr )
+  {
+    if((rc = thread::unpause(p->threadH)) != kOkRC )
+    {
+      rc = cwLogError(rc,"Audio file device thread start failed.");
+      goto errLabel;
+    }
+  }
+ errLabel:
+  return rc;
+}
+
+cw::rc_t   cw::audio::device::file::stop( handle_t h )
+{
+  rc_t       rc = kOkRC;
+  dev_mgr_t* p  = _handleToPtr(h);
+
+  if((rc = thread::pause(p->threadH)) != kOkRC )
+  {
+    rc = cwLogError(rc,"Audio file device thread stop failed.");
+    goto errLabel;
+  }
+
+ errLabel:
+  return rc;
+}
+
+
 unsigned    cw::audio::device::file::deviceCount(          struct driver_str* drv)
 {
   dev_mgr_t* p = _driverToPtr(drv);
   dev_t* d = p->list;
+  unsigned n = 0;
   for(; d!=nullptr; d=d->link)
     ++n;
   return n;
@@ -239,6 +548,7 @@ unsigned    cw::audio::device::file::deviceCount(          struct driver_str* dr
 
 const char* cw::audio::device::file::deviceLabel(          struct driver_str* drv, unsigned devIdx )
 {
+  rc_t       rc= kOkRC;
   dev_t*     d = nullptr;
   dev_mgr_t* p = _driverToPtr(drv);
   
@@ -250,41 +560,78 @@ const char* cw::audio::device::file::deviceLabel(          struct driver_str* dr
 
 unsigned    cw::audio::device::file::deviceChannelCount(   struct driver_str* drv, unsigned devIdx, bool inputFl )
 {
+  rc_t       rc = kOkRC;
   dev_t*     d = nullptr;
   dev_mgr_t* p = _driverToPtr(drv);
   
   if((rc = _indexToDev( p, devIdx, d )) != kOkRC )
     return 0;
 
-  return channelCount( inputFl ? d->iFileH : d->oFileH );
+  audiofile::handle_t fH = inputFl ? d->iFileH : d->oFileH;
+  
+  return fH.isValid() ? channelCount( fH ) : 0;
 }
 
 double      cw::audio::device::file::deviceSampleRate(     struct driver_str* drv, unsigned devIdx )
 {
+  rc_t       rc= kOkRC;
   dev_t*     d = nullptr;
   dev_mgr_t* p = _driverToPtr(drv);
   
   if((rc = _indexToDev( p, devIdx, d )) != kOkRC )
     return 0;
 
-  return inputFl ? d->israte : d->osrate;
+  return d->srate;
 }
 
 unsigned    cw::audio::device::file::deviceFramesPerCycle( struct driver_str* drv, unsigned devIdx, bool inputFl )
 {
+  rc_t       rc= kOkRC;
   dev_t*     d = nullptr;
   dev_mgr_t* p = _driverToPtr(drv);
   
   if((rc = _indexToDev( p, devIdx, d )) != kOkRC )
-    return nullptr;
+    return 0;
 
-  return inputFl ? d->iFramesPerCycle : d->oFramesPerCycle;
+  return d->framesPerCycle;
   
 }
 
-cw::rc_t    cw::audio::device::file::deviceSetup(          struct driver_str* drv, unsigned devIdx, double sr, unsigned frmPerCycle, cbFunc_t cbFunc, void* cbArg )
+cw::rc_t    cw::audio::device::file::deviceSetup( struct driver_str* drv, unsigned devIdx, double srate, unsigned frmPerCycle, cbFunc_t cbFunc, void* cbArg, unsigned cbDevIdx )
 {
-  assert(0); // not yet implemented
+  rc_t       rc0 = kOkRC;
+  rc_t       rc1 = kOkRC;
+  dev_t*     d   = nullptr;
+  dev_mgr_t* p   = _driverToPtr(drv);
+  
+  if((rc0 = _indexToDev( p, devIdx, d )) != kOkRC )
+    return rc0;
+
+  _close_input(d);
+  _close_output(d);
+
+  d->framesPerCycle = frmPerCycle;
+  d->srate          = srate;
+  d->cbFunc         = cbFunc;
+  d->cbArg          = cbArg;
+  d->cbDevIdx       = cbDevIdx;
+
+  unsigned ms = (frmPerCycle * 1000) / srate;
+  if( p->threadTimeOutMs==0 || ms < p->threadTimeOutMs )
+  {
+    p->threadTimeOutMs = ms;
+    cwLogInfo("Audio device file time out %i ms.",p->threadTimeOutMs);
+  }
+  
+  rc0 = _open_input(d, devIdx);
+  rc1 = _open_output(d, devIdx);
+  
+  rc0 = rcSelect(rc0,rc1);
+
+  if(rc0 != kOkRC )
+    rc0 = cwLogError(rc0,"Audio device file '%s' setup failed.",cwStringNullGuard(d->label));
+
+  return rc0;
 }
 
 cw::rc_t    cw::audio::device::file::deviceStart(          struct driver_str* drv, unsigned devIdx )
@@ -296,16 +643,19 @@ cw::rc_t    cw::audio::device::file::deviceStart(          struct driver_str* dr
   
   if((rc0 = _indexToDev( p, devIdx, d )) == kOkRC )
   {
-    if( d->iFileH.isValid() && cwIsSet(d->iFlags,kRewindOnStartFl) )
+    if( d->iFileH.isValid() && cwIsFlag(d->iFlags,kRewindOnStartFl) )
       if((rc0 = seek(d->iFileH,0)) != kOkRC )
         rc0 = cwLogError(rc0,"Rewind on start failed on the audio device file input file.");
 
-    if( d->oFileH.isValid() && cwIsSet(d->oFlags,kRewindOnStartFl) )    
+    if( d->oFileH.isValid() && cwIsFlag(d->oFlags,kRewindOnStartFl) )    
       if((rc1 = seek(d->oFileH,0)) != kOkRC )
         rc1 = cwLogError(rc1,"Rewind on start failed on the audio device file output file.");
   }
   
-  return rcSelect(rc0,rc1);  
+  if((rc0 = rcSelect(rc0,rc1)) == kOkRC )
+    d->isStartedFl = true;
+  
+  return rc0;
 }
 
 cw::rc_t    cw::audio::device::file::deviceStop(           struct driver_str* drv, unsigned devIdx )
@@ -313,30 +663,73 @@ cw::rc_t    cw::audio::device::file::deviceStop(           struct driver_str* dr
   rc_t       rc = kOkRC;
   dev_t*     d  = nullptr;
   dev_mgr_t* p  = _driverToPtr(drv);
-  
+
   if((rc = _indexToDev( p, devIdx, d )) == kOkRC )
-    if( d->oFileH.isValid() )
-      if((rc = flush(d->ofileH)) != kOkRC )
-        rc = cwLogError(rc,"Flush on stop failed on the audio device file output file.");
+    if( d->isStartedFl && d->oFileH.isValid() )
+    {
+      // TODO: implement audiofile::flush()
+      // if((rc = flush(d->ofileH)) != kOkRC )
+      //   rc = cwLogError(rc,"Flush on stop failed on the audio device file output file.");
+      
+      d->isStartedFl = false;
+    }  
 
   return rc;
 }
 
 bool        cw::audio::device::file::deviceIsStarted(      struct driver_str* drv, unsigned devIdx )
 {
+  rc_t       rc = kOkRC;
+  dev_t*     d  = nullptr;
+  dev_mgr_t* p  = _driverToPtr(drv);
+  
+  if((rc = _indexToDev( p, devIdx, d )) == kOkRC )
+    return d->isStartedFl;
+  return false;
+}
+
+bool        cw::audio::device::file::deviceIsAsync(        struct driver_str* drv, unsigned devIdx )
+{
+  return false;
+}
+
+cw::rc_t    cw::audio::device::file::deviceExecute(        struct driver_str* drv, unsigned devIdx )
+{
+  rc_t           rc    = kOkRC;
+  dev_mgr_t*     p     = _driverToPtr(drv);
+  dev_t*         d     = nullptr;
+  
+  if((rc = _indexToDev( p, devIdx, d )) != kOkRC )
+    goto errLabel;
+  
+  std::atomic_store_explicit(&d->readyCnt, d->readyCnt+1, std::memory_order_relaxed); // atomic incr
+
+  mutex::signalCondVar(p->mutexH);
+
+ errLabel:
+  return rc;
+  
 }
 
 void        cw::audio::device::file::deviceRealTimeReport( struct driver_str* drv, unsigned devIdx )
 {
+  rc_t       rc = kOkRC;
+  dev_t*     d  = nullptr;
+  dev_mgr_t* p  = _driverToPtr(drv);
+  
+  if((rc = _indexToDev( p, devIdx, d )) != kOkRC )
+    return;
+    
+  cwLogInfo("file cb i:%i o:%i err i:%i  o:%i frames: i:%i o:%i : th:%i :  %s",d->iCbCnt,d->oCbCnt,d->iErrCnt,d->oErrCnt,d->iFrmCnt,d->oFrmCnt,p->threadCbCnt,cwStringNullGuard(d->label));
+
 }
 
-cw::rc_t    cw::audio::device::file::createInDevice(  handle_t& h, const char* label, const char* audioInFile,  unsigned framesPerCycle, unsigned flags )
+cw::rc_t    cw::audio::device::file::createInDevice(  handle_t& h, const char* label, const char* audioInFName, unsigned flags )
 {
-  rc_t       rc;
+  rc_t       rc = kOkRC;
   handle_t   iFileH;
-  info_t     info;
   dev_t*     d;  
-  dev_mgr_t* p = _handleToPtr(hRef);
+  dev_mgr_t* p = _handleToPtr(h);
   
   // create or find a device
   if((d = _findOrCreateDev(p, label )) == nullptr )
@@ -345,7 +738,7 @@ cw::rc_t    cw::audio::device::file::createInDevice(  handle_t& h, const char* l
     goto errLabel;
   }
 
-  d->iFname  = mem::duplStr(audioInFile);
+  d->iFname  = mem::duplStr(audioInFName);
   d->iFlags  = flags;
   
  errLabel:
@@ -353,11 +746,11 @@ cw::rc_t    cw::audio::device::file::createInDevice(  handle_t& h, const char* l
   return rc;
 }
 
-cw::rc_t    cw::audio::device::file::createOutDevice( handle_t& h, const char* label, const char* audioOutFile, unsigned flags, unsigned chCnt, unsigned bitsPerSample )
+cw::rc_t    cw::audio::device::file::createOutDevice( handle_t& h, const char* label, const char* audioOutFName, unsigned flags, unsigned chCnt, unsigned bitsPerSample )
 {
-  rc_t       rc;
+  rc_t       rc = kOkRC;
   dev_t*     d;  
-  dev_mgr_t* p = _handleToPtr(hRef);
+  dev_mgr_t* p = _handleToPtr(h);
   
   // create or find a device
   if((d = _findOrCreateDev(p, label )) == nullptr )
@@ -366,7 +759,7 @@ cw::rc_t    cw::audio::device::file::createOutDevice( handle_t& h, const char* l
     goto errLabel;
   }
 
-  d->oFname         = mem::duplStr(audioOutFile);
+  d->oFname         = mem::duplStr(audioOutFName);
   d->oFlags         = flags;
   d->oChCnt         = chCnt;
   d->oBitsPerSample = bitsPerSample;
@@ -376,14 +769,21 @@ cw::rc_t    cw::audio::device::file::createOutDevice( handle_t& h, const char* l
   return rc;  
 }
 
-cw::rc_t    cw::audio::device::file::deviceExec( handle_t& h, unsigned devIdx )
-{
-}
 
 cw::rc_t    cw::audio::device::file::report(handle_t h )
 {
+  rc_t rc = kOkRC;
+  dev_mgr_t* p  = _handleToPtr(h);
+  dev_t* d = p->list;
+
+  for(; d!=nullptr; d=d->link)
+    _devReport(d);
+  
+  return rc;
 }
 
 cw::rc_t    cw::audio::device::file::report()
 {
+  rc_t rc = kOkRC;
+  return rc;
 }
diff --git a/cwAudioDeviceFile.h b/cwAudioDeviceFile.h
index 446934c..ced01d0 100644
--- a/cwAudioDeviceFile.h
+++ b/cwAudioDeviceFile.h
@@ -14,24 +14,30 @@ namespace cw
         
         rc_t        create( handle_t& hRef, struct driver_str*& drvRef );
         rc_t        destroy( handle_t& hRef );
+        rc_t        start( handle_t h );
+        rc_t        stop( handle_t h );
         
         unsigned    deviceCount(          struct driver_str* drv);
         const char* deviceLabel(          struct driver_str* drv, unsigned devIdx );
         unsigned    deviceChannelCount(   struct driver_str* drv, unsigned devIdx, bool inputFl );
         double      deviceSampleRate(     struct driver_str* drv, unsigned devIdx );
         unsigned    deviceFramesPerCycle( struct driver_str* drv, unsigned devIdx, bool inputFl );
-        rc_t        deviceSetup(          struct driver_str* drv, unsigned devIdx, double sr, unsigned frmPerCycle, cbFunc_t cbFunc, void* cbArg );
+        rc_t        deviceSetup(          struct driver_str* drv, unsigned devIdx, double sr, unsigned frmPerCycle, cbFunc_t cbFunc, void* cbArg, unsigned cbDevIdx );
         rc_t        deviceStart(          struct driver_str* drv, unsigned devIdx );
         rc_t        deviceStop(           struct driver_str* drv, unsigned devIdx );
         bool        deviceIsStarted(      struct driver_str* drv, unsigned devIdx );
+        bool        deviceIsAsync(        struct driver_str* drv, unsigned devIdx );
+        rc_t        deviceExecute(        struct driver_str* drv, unsigned devIdx );                
         void        deviceRealTimeReport( struct driver_str* drv, unsigned devIdx );
 
         enum {
           kRewindOnStartFl = 0x01,
         };
-        
-        rc_t        createInDevice(  handle_t& h, const char* label, const char* audioInFile,  unsigned flags );
-        rc_t        createOutDevice( handle_t& h, const char* label, const char* audioOutFile, unsigned flags, unsigned chCnt, unsigned bitsPerSample );
+
+        // A device may have an input, an output or both.
+        // A device with both an input and output can be created by assigning both to the same label
+        rc_t        createInDevice(  handle_t& h, const char* label, const char* audioInFName,  unsigned flags );
+        rc_t        createOutDevice( handle_t& h, const char* label, const char* audioOutFName, unsigned flags, unsigned chCnt, unsigned bitsPerSample );
 
         // Generate an audio callback on the specified device.
         rc_t        deviceExec( handle_t& h, unsigned devIdx );