let shifts = [-1, 1, 2, -2, 8, 4];

​

function preload() {

  soundFile = loadSound('dd2ed901-8e3b-49d4-b57e-78908870861e.mp3');

}

 function setup() {

  describe('a sketch that loops a sample of a guitar note, each time the note is played the pitch is shifted');

​

  cnv = createCanvas(100, 100);

  cnv.mousePressed(startSound);

  background(220);

  textAlign(CENTER);

  textSize(9);

  text('click to play sound', width/2, height/2);

  pitchShifter = new p5.PitchShifter();

  soundFile.disconnect();

  soundFile.connect(pitchShifter);

  //change the pitch and retrigger sample when done playing

  soundFile.onended(changePitch);

}

​

function startSound () {

  //only let the sound file play once

  if(!soundFile.isPlaying()) {

    soundFile.play();

    background(220);

    text('sound is playing', width/2, height/2);

  }

}

function changePitch () {

  let pitchValue = random(shifts);

  pitchShifter.shift(pitchValue);

  soundFile.play();

}

​