Several fixes.

MicroMDAEPiano.ino

@@ -120,7 +120,6 @@ elapsedMillis cpu_mem_millis;
 
 enum MDA_EP_PARAM { DECAY, RELEASE, HARDNESS, TREBLE, PAN_TREM, LFO_RATE, VELOCITY_SENSE, STEREO, MAX_POLY, TUNE, DETUNE, OVERDRIVE };
 
-
 //*************************************************************************************************
 //* SETUP FUNCTION
 //*************************************************************************************************
@@ -226,7 +225,7 @@ void setup()
   Serial.print(F("AUDIO_BLOCK_SAMPLES="));
   Serial.print(AUDIO_BLOCK_SAMPLES);
   Serial.print(F(" (Time per block="));
-  Serial.print(1000000 / (SAMPLE_RATE / AUDIO_BLOCK_SAMPLES));
+  Serial.print(audio_block_time_us);
   Serial.println(F("ms)"));
 
   ep->setParameter(DECAY, 0.5);
@@ -247,7 +246,7 @@ void setup()
   mixer_r.gain(1, 0.3);
   mixer_l.gain(1, 0.3);
 
-  AudioNoInterrupts();
+  AudioInterrupts();
   Serial.println(F("<setup end>"));
 
 #if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
@@ -322,6 +321,7 @@ void loop()
   midi_serial.read();
 #endif
 #ifdef MIDI_DEVICE_USB_HOST
+  usb_host.Task();
   midi_usb.read();
 #endif
 #ifdef MIDI_DEVICE_USB
@@ -566,6 +566,7 @@ void handleControlChange_MIDI_DEVICE_USB(byte inChannel, byte inData1, byte inDa
 
 void handleNoteOn(byte inChannel, byte inNumber, byte inVelocity)
 {
+  Serial.println("NON");
   if (checkMidiChannel(inChannel))
   {
     ep->noteOn(inNumber, inVelocity);
@@ -574,6 +575,7 @@ void handleNoteOn(byte inChannel, byte inNumber, byte inVelocity)
 
 void handleNoteOff(byte inChannel, byte inNumber, byte inVelocity)
 {
+  Serial.println("NOFF");
   if (checkMidiChannel(inChannel))
   {
     ep->noteOn(inNumber, 0);
@@ -591,7 +593,7 @@ void handleControlChange(byte inChannel, byte inData1, byte inData2)
 bool checkMidiChannel(byte inChannel)
 {
   // check for MIDI channel
-  if (inChannel == MIDI_CHANNEL_OMNI)
+  if (midi_channel == MIDI_CHANNEL_OMNI)
   {
     return (true);
   }