Midi_Pass_Through.pde

import themidibus.*;
import javax.sound.midi.MidiMessage; 
import javax.sound.midi.ShortMessage; 

MidiBus myBus;    // MidiBus

void setup() {

    MidiBus.list();                     //MIDI list
    myBus = new MidiBus(this, 0, 4);    //MIDI input,output

}

void midiMessage(MidiMessage message, long timestamp, String bus_name) { 
  int note = (int)(message.getMessage()[1] & 0xFF) ;
  int vel = (int)(message.getMessage()[2] & 0xFF);
  
  if(message.getStatus() == ShortMessage.NOTE_ON) myBus.sendNoteOn(0, note, vel);
  if(message.getStatus() == ShortMessage.NOTE_OFF) myBus.sendNoteOff(0, note, vel);
}