import themidibus.*; //Import the library
MidiBus myBus; // The MidiBus
int instrument = 118; //Synth Drum
int lastBeat;
float beatLength;

void setup() {
  size(400,200);
  background(0);
  myBus = new MidiBus(this, -1, "Microsoft MIDI Mapper");
  setInstrument(instrument);
  frameRate(60);
  lastBeat = millis();
  beatLength = 500;
}

void draw() {
  background(0);
  int channel = 0;
  int pitch = 48;  //drum
  int velocity = 127;
    if(millis() - lastBeat > beatLength){
    lastBeat = millis();
    myBus.sendNoteOn(0, pitch, 80);
  }
}

void setInstrument(int value)
{
  byte data[] = new byte[2];
  data[0] = (byte)0xC0;
  data[1] = (byte)value;
  myBus.sendMessage(data);
}