let bassline = null;

​

function setInstruments() {

  percussion = function (instr, amp, dur, old) {

    let t = secs(dur);

    let delta = audioClock() - (t + old);

    if (delta >= 0) {

      drums.play(t - delta, instr, amp);

      setTimeout(percussion.bind(null, instr, amp, dur, audioClock() - delta));

    } else setTimeout(percussion.bind(null, instr, amp, dur, old));

  };

​

  bassline = function (note, amp, dur, old) {

    let t = secs(dur);

    let delta = audioClock() - (t + old);

    if (delta >= 0) {

      bass.play(t - delta, note, amp);

      bass.stop(t - delta + t * 0.9, note);

      note += 7;

      if (note > Bb[3]) note -= 24;

      setTimeout(bassline.bind(null, note, amp, dur, audioClock() - delta));

    } else setTimeout(bassline.bind(null, note, amp, dur, old));

  };

}

​

function startPattern() {

  let t = audioClock();

  percussion(cymbal, 0.9, 1, t);

  percussion(kick, 0.1, 1.5, t);

  percussion(snare, 0.1, 2, t);

  bassline(Eb[3], 0.1, 1, t);

}

​

function playPattern() {

  setInstruments();

  startPattern();

}

​

function stop() {

  percussion = function () {};

  bassline = function () {};

}

​

function setup() {

  setBpm(180);

  start().then(playPattern);

}

​

function draw() {}

​