let button;

​

function setup() {

  noCanvas();

  button = createButton("Click Me", width/2, height/2);

  button.mousePressed(buttonPressed);

}

​

function buttonPressed(){

    if(midiOutput){

        // Play note "C2" on channel 10 for half a second and with 0.5 velocity

    // (a noteOff message will be sent in half a second)

        midiOutput.playNote("C3", 10, {duration: 500, velocity: 1});

    }

    else{

        console.log("Looks like there is no MIDI output device.");

    }

}

​

WebMidi.enable(function (err) {

  if (err) {

    console.log("WebMidi could not be enabled.", err);

  }

  // Print available MIDI outputs

  for(let i = 0; i < WebMidi.outputs.length; i++){

    console.log(WebMidi.outputs[i].name);

  }

  // From the list on the console, pick an output name:

  midiOutput = WebMidi.getOutputByName("IAC Driver Bus 1");

​

});