// MIDI Output Note On/Off Boiler Plate 
// MIDI out setup, make a MidiOut object, open it on a device
MidiOut mout;

// MIDI Port (Window > Device Browser > MIDI > Output)
0 => int port;

// try to open that port, fail gracefully
if( !mout.open(port) )
{
    <<< "Error: MIDI port did not open on port: ", port >>>;
    me.exit();
}

// Make a MIDI msg holder for sending
MidiMsg msg;

// utility function to send MIDI out notes
fun void MIDInote(int onoff, int note, int velocity)
{
    if (onoff == 0) 128 => msg.data1;
    else            144 => msg.data1;
    note => msg.data2;
    velocity => msg.data3;
    mout.send(msg);
}

// loop, sending random notes and velocities
while( true )
{
    Math.random2(60,100) => int note;
    Math.random2(30,127) => int velocity;
    MIDInote(1, note, velocity);
    .1::second => now;        // hang out for 100ms
    MIDInote(0, note ,velocity);
    .1::second => now;        // hang out for 100ms
}