diff --git a/cwIo.cpp b/cwIo.cpp
index 515a9c6..024f215 100644
--- a/cwIo.cpp
+++ b/cwIo.cpp
@@ -9,7 +9,7 @@
 #include "cwIo.h"
 
 #include "cwMidi.h"
-#include "cwMidiPort.h"
+#include "cwMidiDevice.h"
 
 
 #include "cwObject.h"
@@ -609,7 +609,7 @@ namespace cw
         msg_t                 m;
         midi_msg_t            mm;
         const midi::packet_t* pkt = pktArray + i;        
-        io_t*                 p   = reinterpret_cast<io_t*>(pkt->cbDataPtr);
+        io_t*                 p   = reinterpret_cast<io_t*>(pkt->cbArg);
         rc_t                  rc  = kOkRC;
 
         
@@ -633,7 +633,6 @@ namespace cw
     rc_t _midiPortCreate( io_t* p, const object_t* c )
     {
       rc_t     rc             = kOkRC;
-      unsigned parserBufByteN = 1024;
       const object_t* cfg = nullptr;
 
       // get the MIDI port cfg
@@ -643,14 +642,12 @@ namespace cw
         return kOkRC;
       }
       
-      if((rc = cfg->getv("parserBufByteN", parserBufByteN,
-                         "asyncFl", p->midiAsyncFl )) != kOkRC )
+      if((rc = cfg->getv("asyncFl", p->midiAsyncFl )) != kOkRC )
       {
         rc = cwLogError(kSyntaxErrorRC,"MIDI configuration parse failed.");
       }
           
-      // initialie the MIDI system
-      if((rc = create(p->midiH, _midiCallback, p, parserBufByteN, "app")) != kOkRC )
+      if((rc = create(p->midiH, _midiCallback, p, cfg)) != kOkRC )
         return rc;
 
       
@@ -3807,7 +3804,7 @@ void cw::io::latency_measure_setup(handle_t h)
   p->latency_meas_result.audio_out_rms_max = 0;
 
   if( p->midiH.isValid() )
-    latency_measure_setup(p->midiH);  
+    latency_measure_reset(p->midiH);  
 }
 
 cw::io::latency_meas_result_t cw::io::latency_measure_result(handle_t h)
@@ -3816,10 +3813,10 @@ cw::io::latency_meas_result_t cw::io::latency_measure_result(handle_t h)
 
   if( p->midiH.isValid() )
   {
-    midi::device::latency_meas_result_t r = latency_measure_result(p->midiH);
+    midi::device::latency_meas_combined_result_t r = latency_measure_result(p->midiH);
 
-    p->latency_meas_result.note_on_input_ts  = r.note_on_input_ts;
-    p->latency_meas_result.note_on_output_ts = r.note_on_output_ts;
+    p->latency_meas_result.note_on_input_ts  = r.alsa_dev.note_on_input_ts;
+    p->latency_meas_result.note_on_output_ts = r.alsa_dev.note_on_output_ts;
   }
   
   return p->latency_meas_result;
diff --git a/cwIoAudioMidi.cpp b/cwIoAudioMidi.cpp
index 96324a3..b7ebc07 100644
--- a/cwIoAudioMidi.cpp
+++ b/cwIoAudioMidi.cpp
@@ -870,8 +870,8 @@ namespace cw
                   am->devIdx    = pkt->devIdx;
                   am->portIdx   = pkt->portIdx;
                   am->timestamp = mm->timeStamp;
-                  am->ch        = mm->status & 0x0f;
-                  am->status    = mm->status & 0xf0;
+                  am->ch        = mm->ch;
+                  am->status    = mm->status;
                   am->d0        = mm->d0;
                   am->d1        = mm->d1;
 
diff --git a/cwIoMidiRecordPlay.cpp b/cwIoMidiRecordPlay.cpp
index 228ca2e..bdaa225 100644
--- a/cwIoMidiRecordPlay.cpp
+++ b/cwIoMidiRecordPlay.cpp
@@ -1355,7 +1355,7 @@ namespace cw
               {
                 //printf("R:%i %i %i\n",mm->status, mm->d0, mm->d1);
         
-                const am_midi_msg_t* am = _midi_store( p, pkt->devIdx, pkt->portIdx, mm->timeStamp, mm->status & 0x0f, mm->status & 0xf0, mm->d0, mm->d1 );
+                const am_midi_msg_t* am = _midi_store( p, pkt->devIdx, pkt->portIdx, mm->timeStamp, mm->ch, mm->status, mm->d0, mm->d1 );
 
                 if( p->thruFl && am != nullptr )
                   _transmit_msg( p, am, false );
diff --git a/cwIoPresetSelApp.cpp b/cwIoPresetSelApp.cpp
index 8f630e3..c38c9b7 100644
--- a/cwIoPresetSelApp.cpp
+++ b/cwIoPresetSelApp.cpp
@@ -1142,8 +1142,8 @@ namespace cw
             
             if( midi::isChStatus(mm->status) )
             {
-              if(midi_record_play::send_midi_msg( app->mrpH, midi_record_play::kSampler_MRP_DevIdx, mm->status & 0x0f, mm->status & 0xf0, mm->d0, mm->d1 ) == kOkRC )                
-                _midi_play_callback( app, midi_record_play::kMidiEventActionId, id, timestamp, loc, nullptr, mm->status & 0x0f, mm->status & 0xf0, mm->d0, mm->d1 );
+              if(midi_record_play::send_midi_msg( app->mrpH, midi_record_play::kSampler_MRP_DevIdx, mm->ch, mm->status, mm->d0, mm->d1 ) == kOkRC )                
+                _midi_play_callback( app, midi_record_play::kMidiEventActionId, id, timestamp, loc, nullptr, mm->ch, mm->status, mm->d0, mm->d1 );
             }
 
           }
diff --git a/cwMidiDecls.h b/cwMidiDecls.h
index 9e456fb..9746385 100644
--- a/cwMidiDecls.h
+++ b/cwMidiDecls.h
@@ -8,21 +8,25 @@ namespace cw
     typedef struct  msg_str
     {
       time::spec_t timeStamp;
-      uint8_t status;  // midi status byte
-      uint8_t d0;      // midi data byte 0
-      uint8_t d1;      // midi data byte 1
-      uint8_t pad;
+      unsigned uid;     // application specified id
+      uint8_t  ch;      // midi channel
+      uint8_t  status;  // midi status byte (channel has been removed)
+      uint8_t  d0;      // midi data byte 0
+      uint8_t  d1;      // midi data byte 1
     } msg_t;
 
     typedef struct packet_str
     {
-      void*         cbDataPtr; // Application supplied reference value
+      void*         cbArg; // Application supplied reference value
       unsigned      devIdx;    // The device the msg originated from
       unsigned      portIdx;   // The port index on the source device
       msg_t*        msgArray;  // Pointer to an array of 'msgCnt' mdMsg records or NULL if sysExMsg is non-NULL
       uint8_t*      sysExMsg;  // Pointer to a sys-ex msg or NULL if msgArray is non-NULL (see note below)
       unsigned      msgCnt;    // Count of mdMsg records or sys-ex bytes
     } packet_t;
+
+    typedef void (*cbFunc_t)( const packet_t* pktArray, unsigned pktCnt );
+
   }
 }
 #endif
diff --git a/cwMidiPort.cpp b/cwMidiDevice.cpp
similarity index 100%
rename from cwMidiPort.cpp
rename to cwMidiDevice.cpp
diff --git a/cwMidiPort.h b/cwMidiDevice.h
similarity index 100%
rename from cwMidiPort.h
rename to cwMidiDevice.h