Tone.Transport.scheduleRepeat(playBeat, "4n");

Tone.Transport.start();

​

​

​

function playBeat() {

  let beat = Tone.Transport.position.split(":")[1];

  if(beat == 0){

    synth.triggerAttackRelease("C2", "4n");

  }

  else{

    if(random() > 0.3){

      let notes = ["G2", "A2", "B2", "C3"];

      let posNote = int(random(notes.length));

      let durations = ["4n", "8n", "16n", "32n"];

      let posDuration = int(random(durations.length));

      synth.triggerAttackRelease(notes[posNote],durations[posDuration])

    }

  }

}

​