diff --git a/cmSyncRecd.c b/cmSyncRecd.c
new file mode 100644
index 0000000..300f071
--- /dev/null
+++ b/cmSyncRecd.c
@@ -0,0 +1,437 @@
+#include "cmGlobal.h"
+#include "cmFloatTypes.h"
+#include "cmRpt.h"
+#include "cmErr.h"
+#include "cmCtx.h"
+#include "cmMem.h"
+#include "cmMallocDebug.h"
+#include "cmTime.h"
+#include "cmFile.h"
+#include "cmAudioFile.h"
+#include "cmSyncRecd.h"
+
+
+typedef enum
+{
+kInvalidSrId,
+  kMidiSrId,
+  kAudioSrId
+  } cmSrTypeId_t;
+
+typedef struct cmSrMidi_str
+{
+  cmTimeSpec_t timestamp;
+  unsigned     status;
+  unsigned     d0;
+  unsigned     d1;
+} cmSrMidi_t;
+
+typedef struct cmSrAudio_str
+{
+  cmTimeSpec_t timestamp;
+  unsigned     smpIdx;
+} cmSrAudio_t;
+
+typedef struct cmSrRecd_str
+{
+  cmSrTypeId_t tid;
+  union
+  {
+    cmSrMidi_t  m;
+    cmSrAudio_t a;
+  } u;
+
+} cmSrRecd_t;
+
+
+enum
+{
+  kReadSrFl = 0x01,   // This is a read (not a write) file
+
+  kFileUUSrId = 0xf00d
+};
+
+typedef struct cmSr_str
+{
+  cmErr_t        err;
+  cmFileH_t      fH;
+  cmAudioFileH_t afH;
+  unsigned       flags;  // See kXXXSrFl 
+  cmSrRecd_t*    cache;  // cache[cn]
+  cmSrAudio_t*   map;    // 
+  unsigned       cn;     // count of records in cache[].
+  unsigned       ci;     // next cache recd index
+  unsigned       fn;     // count of recds written to file
+  long           offs;
+} cmSr_t;
+
+
+
+
+cmSr_t* _cmSrHtoP( cmSyncRecdH_t h )
+{
+  cmSr_t* p = (cmSr_t*)h.h;
+  assert(p!=NULL);
+  return p;
+}
+
+cmSrRC_t _cmSrWriteCache( cmSr_t* p )
+{
+  if( cmFileWrite(p->fH,p->cache,p->ci * sizeof(cmSrRecd_t)) != kOkFileRC )
+    return cmErrMsg(&p->err,kFileFailSrRC,"File write failed.");
+
+  p->fn += p->ci;
+  p->ci = 0;
+  
+  return kOkSrRC;
+}
+
+
+cmSrRC_t _cmSrFinal( cmSr_t* p )
+{
+  cmSrRC_t rc = kOkSrRC;
+  
+  // write any remaining cache records
+  if( cmIsFlag(p->flags,kReadSrFl) == false )
+  {
+    if((rc = _cmSrWriteCache(p)) == kOkSrRC )
+    {
+      if(cmFileSeek(p->fH,kBeginFileFl,p->offs) != kOkFileRC )
+        rc = cmErrMsg(&p->err,kFileFailSrRC, "File seek fail on file offset positioning.");
+      else
+        if(cmFileWriteUInt(p->fH,&p->fn,1) != kOkFileRC )
+          rc = cmErrMsg(&p->err,kFileFailSrRC, "File write failed on record count.");
+    }
+  }
+
+  // release the audio file object
+  if( cmAudioFileIsValid(p->afH) )
+    if( cmAudioFileDelete(&p->afH) != kOkAfRC )
+      return cmErrMsg(&p->err,kAudioFileFailSrRC,"Audio file object delete failed.");
+
+  // release the sync-recd file object
+  if( cmFileIsValid(p->fH) )
+    if( cmFileClose(&p->fH) != kOkFileRC )
+      return cmErrMsg(&p->err,kFileFailSrRC,"File close failed.");
+
+  cmMemFree(p->cache);
+  cmMemFree(p->map);
+  cmMemFree(p);
+
+  return rc;
+}
+
+cmSr_t*  _cmSrAlloc( cmCtx_t* ctx, unsigned flags )
+{
+  cmSr_t* p = cmMemAllocZ(cmSr_t,1);
+
+  cmErrSetup(&p->err,&ctx->rpt,"SyncRecd");
+
+  p->cn    = 2048;
+  p->cache = cmMemAllocZ(cmSrRecd_t,p->cn);
+
+  return p;
+}
+
+cmSrRC_t cmSyncRecdCreate( cmCtx_t* ctx, cmSyncRecdH_t* hp, const cmChar_t* srFn, const cmChar_t* audioFn, double srate, unsigned chCnt, unsigned bits )
+{
+  cmSrRC_t rc   = kOkSrRC;
+  cmRC_t   afRC = kOkAfRC;
+
+  assert( audioFn != NULL );
+
+  if((rc = cmSyncRecdFinal(hp)) != kOkSrRC )
+    return rc;
+
+  cmSr_t* p = _cmSrAlloc(ctx,0);
+
+  if( cmFileOpen(&p->fH,srFn,kWriteFileFl,&ctx->rpt) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to create the sync-recd file '%s'.",cmStringNullGuard(srFn));
+    goto errLabel;
+  }
+
+  if( cmAudioFileIsValid(p->afH = cmAudioFileNewCreate(audioFn,srate,bits,chCnt,&afRC,&ctx->rpt))==false)
+  {
+    rc = cmErrMsg(&p->err,kAudioFileFailSrRC,"Unable to create the sync-recd audio file '%s'.",cmStringNullGuard(audioFn));
+    goto errLabel;
+  }
+
+  unsigned fileUUId = kFileUUSrId;
+  unsigned audioFnCnt = strlen(audioFn)+1;
+
+  if( cmFileWriteUInt(p->fH,&fileUUId,1) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File write failed on UUID.");
+    goto errLabel;
+  }
+
+  if( cmFileWriteUInt(p->fH,&audioFnCnt,1) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File write failed on audio file length write count.");
+    goto errLabel;
+  }
+
+  if( cmFileWriteChar(p->fH,audioFn,audioFnCnt) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File write failed on audio file string.");
+    goto errLabel;
+  }
+
+  if( cmFileTell(p->fH,&p->offs) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to determine file offset.");
+    goto errLabel;
+  }
+
+  if( cmFileWriteUInt(p->fH,&p->fn,1) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File write failed on initial record count.");
+    goto errLabel;
+  }
+
+  hp->h = p;
+
+ errLabel:
+  if( rc != kOkSrRC )
+    _cmSrFinal(p);
+
+  return rc;
+}
+
+
+cmSrRC_t cmSyncRecdOpen(   cmCtx_t* ctx, cmSyncRecdH_t* hp, const cmChar_t* srFn )
+{
+  cmSrRC_t  rc         = kOkSrRC;
+  cmRC_t    afRC       = kOkAfRC;
+  unsigned  fileUUId   = cmInvalidId;
+  unsigned  audioFnCnt = 0;
+  cmChar_t* audioFn    = NULL;
+  cmAudioFileInfo_t afInfo;
+  unsigned i;
+  unsigned acnt = 0;
+  unsigned mcnt = 0;
+  unsigned* tiV  = NULL;
+
+  if((rc = cmSyncRecdFinal(hp)) != kOkSrRC )
+    return rc;
+
+  cmSr_t* p = _cmSrAlloc(ctx,kReadSrFl);
+
+  if( cmFileOpen(&p->fH,srFn,kReadFileFl,&ctx->rpt) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to open the sync-recd file '%s'.",cmStringNullGuard(srFn));
+    goto errLabel;
+  }
+
+  if( cmFileReadUInt(p->fH,&fileUUId,1) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File read failed on UUId.");
+    goto errLabel;
+  }
+
+  if( cmFileReadUInt(p->fH,&audioFnCnt,1) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File read failed on audio file name count.");
+    goto errLabel;
+  }
+
+  audioFn = cmMemAllocZ(cmChar_t,audioFnCnt);
+
+  if( cmFileReadChar(p->fH,audioFn,audioFnCnt) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File read failed on audio file string.");
+    goto errLabel;
+  }
+
+  if( cmFileReadUInt(p->fH,&p->fn,1) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"File read failed on record count.");
+    goto errLabel;
+  }
+
+  // store the file offset to the first recd
+  if( cmFileTell(p->fH,&p->offs) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to determine the current file offset.");
+    goto errLabel;
+  }
+
+
+  // read each file - and count the types
+  for(i=0; i<p->fn; ++i)
+  {
+    cmSrRecd_t r;
+    if( cmFileRead(p->fH,&r,sizeof(r)) != kOkFileRC )
+    {
+      rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to read the record at index %i.");
+      goto errLabel;
+    }
+
+    switch(r.tid)
+    {
+      case kMidiSrId:
+        mcnt += 1;
+        break;
+
+      case kAudioSrId:
+        acnt += 1;
+        break;
+
+      default:
+        { assert(0); }
+    }
+  }
+
+  // rewind to the begining of the records
+  if( cmFileSeek(p->fH,kBeginFileFl,p->offs) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to seek to first recd offset.");
+    goto errLabel;
+  }
+
+  // allocate space to hold the MIDI records
+  p->cn    = mcnt;
+  p->ci    = 0;
+  p->cache = cmMemResizeZ(cmSrRecd_t,p->cache,p->cn);
+  p->map   = cmMemAllocZ(cmSrAudio_t,p->cn);
+  tiV      = cmMemAllocZ(unsigned,p->cn);
+  
+  for(i=0; p->ci<p->cn && i<p->fn; ++i)
+  {
+    if( cmFileRead(p->fH,p->cache + p->ci,sizeof(cmSrRecd_t)) != kOkFileRC )
+    {
+      rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to read the record at index %i.");
+      goto errLabel;
+    }
+
+    if( p->cache[p->ci].tid == kMidiSrId )
+      p->ci += 1;
+  }
+
+  // assert that all the MIDI records were read
+  assert( p->ci == p->cn);
+
+  // rewind to the first recd
+  if( cmFileSeek(p->fH,kBeginFileFl,p->offs) != kOkFileRC )
+  {
+    rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to seek to first recd offset.");
+    goto errLabel;
+  }
+
+
+  // for each recd in the file
+  for(i=0; i<p->fn; ++i)
+  {
+    cmSrRecd_t r;
+    if( cmFileRead(p->fH,&r,sizeof(r)) != kOkFileRC )
+    {
+      rc = cmErrMsg(&p->err,kFileFailSrRC,"Unable to read the record at index %i.");
+      goto errLabel;
+    }
+
+    // if this is an audio record
+    if( r.tid == kAudioSrId )
+    {
+      unsigned j;
+      
+      // for each midi record
+      for(j=0; j<p->cn; ++j)
+      {
+        // measure the time interval between this midi and this audio recd
+        unsigned time_interval_micros = cmTimeAbsElapsedMicros(&r.u.a.timestamp,&p->cache[j].u.m.timestamp);
+
+        // if the audio recd is closer to this midi recd than prior audio records ...
+        if( tiV[j] < time_interval_micros || i==0 )
+        {
+          // ... then store the audio time stamp in the map
+          tiV[j]            = time_interval_micros;
+          p->map->timestamp = r.u.a.timestamp;
+          p->map->smpIdx    = r.u.a.smpIdx;
+        }        
+      }
+    }
+  }
+
+  // open the audio file
+  if( cmAudioFileIsValid(p->afH = cmAudioFileNewOpen(audioFn,&afInfo,&afRC,&ctx->rpt ))==false)
+  {
+    rc = cmErrMsg(&p->err,kAudioFileFailSrRC,"Unable to open the sync-recd audio file '%s'.",cmStringNullGuard(audioFn));
+    goto errLabel;
+  }
+ 
+  p->flags = cmSetFlag(p->flags,kReadSrFl);
+
+  hp->h    = p;
+
+ errLabel:
+
+  cmMemFree(tiV);
+  cmMemFree(audioFn);
+
+  if( rc != kOkSrRC )
+    _cmSrFinal(p);
+
+  return rc;
+}
+
+cmSrRC_t cmSyncRecdFinal(  cmSyncRecdH_t* hp )
+{
+  cmSrRC_t rc = kOkSrRC;
+
+  if( hp==NULL || cmSyncRecdIsValid(*hp)==false)
+    return rc;
+
+  cmSr_t* p = _cmSrHtoP(*hp);
+
+  if((rc = _cmSrFinal(p)) != kOkSrRC )
+    return rc;
+
+  hp->h = NULL;
+
+  return rc;
+}
+
+bool     cmSyncRecdIsValid( cmSyncRecdH_t h )
+{ return h.h != NULL; }
+
+cmSrRC_t cmSyncRecdMidiWrite(  cmSyncRecdH_t h, const cmTimeSpec_t* timestamp, unsigned status, unsigned d0, unsigned d1 )
+{
+  cmSrRC_t    rc    = kOkSrRC;
+  cmSr_t*     p     = _cmSrHtoP(h);
+  cmSrRecd_t* rp    = p->cache + p->ci;
+  rp->tid           = kMidiSrId;
+  rp->u.m.timestamp = *timestamp;
+  rp->u.m.status    = status;
+  rp->u.m.d0        = d0;
+  rp->u.m.d1        = d1;
+
+  p->ci += 1;
+
+  if( p->ci == p->cn )
+    rc = _cmSrWriteCache(p);
+  
+  return rc;
+}
+
+cmSrRC_t cmSyncRecdAudioWrite( cmSyncRecdH_t h, const cmTimeSpec_t* timestamp, unsigned smpIdx, const cmSample_t* ch[], unsigned chCnt, unsigned frmCnt )
+{
+  cmSrRC_t    rc    = kOkSrRC;
+  cmSr_t*     p     = _cmSrHtoP(h);
+  cmSrRecd_t* rp    = p->cache + p->ci;
+  rp->tid           = kAudioSrId;
+  rp->u.a.timestamp = *timestamp;
+  rp->u.a.smpIdx    =  smpIdx;
+
+  p->ci += 1;
+
+  if( p->ci == p->cn )
+    if((rc = _cmSrWriteCache(p)) != kOkSrRC )
+      goto errLabel;
+
+  if( cmAudioFileWriteSample(p->afH,frmCnt,chCnt,(cmSample_t**)ch) != kOkAfRC )
+    rc = cmErrMsg(&p->err,kAudioFileFailSrRC,"Audio file write failed.");
+
+ errLabel:
+  return rc;
+}
diff --git a/cmSyncRecd.h b/cmSyncRecd.h
new file mode 100644
index 0000000..1ded5f7
--- /dev/null
+++ b/cmSyncRecd.h
@@ -0,0 +1,32 @@
+#ifndef cmSyncRecd_h
+#define cmSyncRecd_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  enum
+  {
+    kOkSrRC,
+    kFileFailSrRC,
+    kAudioFileFailSrRC
+  };
+
+  typedef cmHandle_t cmSyncRecdH_t;
+  typedef cmRC_t     cmSrRC_t;
+  extern cmSyncRecdH_t cmSyncRecdNullHandle;
+  
+  cmSrRC_t cmSyncRecdCreate(  cmCtx_t* ctx, cmSyncRecdH_t* hp, const cmChar_t* srFn, const cmChar_t* audioFn, double srate, unsigned chCnt, unsigned bits );
+  cmSrRC_t cmSyncRecdOpen(    cmCtx_t* ctx, cmSyncRecdH_t* hp, const cmChar_t* srFn );
+  cmSrRC_t cmSyncRecdFinal(   cmSyncRecdH_t* hp );
+  bool     cmSyncRecdIsValid( cmSyncRecdH_t h );
+
+  cmSrRC_t cmSyncRecdMidiWrite(  cmSyncRecdH_t h, const cmTimeSpec_t* timestamp, unsigned status, unsigned d0, unsigned d1 );
+  cmSrRC_t cmSyncRecdAudioWrite( cmSyncRecdH_t h, const cmTimeSpec_t* timestamp, unsigned smpIdx, const cmSample_t* ch[], unsigned chCnt, unsigned frmCnt );
+  
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif