diff --git a/cwIo.cpp b/cwIo.cpp
index c3c6147..1ac1da7 100644
--- a/cwIo.cpp
+++ b/cwIo.cpp
@@ -2883,6 +2883,30 @@ cw::rc_t cw::io::midiDeviceSend( handle_t h, unsigned devIdx, unsigned portIdx,
   return midi::device::send( p->midiH, devIdx, portIdx, status, d0, d1 );
 }
 
+cw::rc_t cw::io::midiDeviceAllNotesOff( handle_t h, unsigned devIdx, unsigned portIdx )
+{
+  rc_t rc = kOkRC;
+  unsigned devN = midiDeviceCount(h);
+  for(unsigned i=0; i<devN; ++i)
+    if( devIdx==kInvalidIdx || devIdx==i )
+    {
+      unsigned portN = midiDevicePortCount(h,i,false);
+      for(unsigned j=0; j<portN; ++j)
+        if( portIdx==kInvalidIdx || portIdx==j )
+        {
+          rc_t rc0;
+          if((rc0 = midiDeviceSend(h,i,j,midi::kCtlMdId,121,0)) != kOkRC) // reset all controllers
+            rc = cwLogError(rc0,"Send reset all controllers failed on %i:%i.",i,j);
+          
+          if((rc0 =  midiDeviceSend(h,i,j,midi::kCtlMdId,123,0)) != kOkRC) // all notes off
+            rc = cwLogError(rc0,"Send all-notes-off failed on %i:%i.",i,j);
+        }
+            
+    }
+  
+  return rc;
+}
+
 unsigned cw::io::midiDeviceMaxBufferMsgCount( handle_t h )
 {
   io_t* p = _handleToPtr(h);
diff --git a/cwIo.h b/cwIo.h
index 0040187..9fb1106 100644
--- a/cwIo.h
+++ b/cwIo.h
@@ -235,6 +235,7 @@ namespace cw
     const char* midiDevicePortName(  handle_t h, unsigned devIdx, bool inputFl, unsigned portIdx );
     unsigned    midiDevicePortIndex( handle_t h, unsigned devIdx, bool inputFl, const char* portName );    
     rc_t        midiDeviceSend(      handle_t h, unsigned devIdx, unsigned portIdx, uint8_t status, uint8_t d0, uint8_t d1 );
+    rc_t        midiDeviceAllNotesOff( handle_t h, unsigned devIdx=kInvalidIdx, unsigned portIdx=kInvalidIdx );
 
     unsigned              midiDeviceMaxBufferMsgCount( handle_t h );
     const midi::ch_msg_t* midiDeviceBuffer(      handle_t h, unsigned& msgCntRef );