Library hell - specifically tinysub and MIDI in general

Projects Programming
10

To be fair there is also USB-MIDI.h in which the 'AllEvents' example should be nearly self-explanatory. Although if listening on the Serial port for Midi,

static void OnControlChange(byte channel, byte number, byte value) {
  Serial.print(F("ControlChange from channel: "));
  Serial.print(channel);
  Serial.print(F(", number: "));
  Serial.print(number);
  Serial.print(F(", value: "));
  Serial.println(value);
}

It might not be practical to send the results found, back on that same port in a different format.
But you can confirm it's functionality by making the program do whatever you want.
I would try and receive a CC msg and send back a note on or off for instance.

static void OnControlChange(byte channel, byte number, byte value) {
  if (number == 70) {
     if (value > 63)  MIDI.sendNoteOn(42, 100, 1);
     else MIDI.sendNoteOff(42, 0, 1);
  }
}