let stopButton;

const synth = new Tone.Synth().toDestination();

synth.oscillator.type = "sawtooth";

​

// Create a filter and set cutoff frequency and filter type

const filter = new Tone.Filter(500, "lowpass")

// Pass our synth into the filter

synth.chain(filter);

// Connect the filter to the output

filter.toDestination();

​

function setup() {

  createCanvas(400, 400);

  startButton = createButton("make noise!");

  stopButton = createButton("stop noise!");

  startButton.mousePressed(makeNoise);

  stopButton.mousePressed(stopNoise);

  textSize(24);

}

​

function draw() {

  background('coral');

  strokeWeight(2);

  drawAmplitude();

}

​

function makeNoise() {

  Tone.start();

  synth.triggerAttack("C4", "8n");

}

​

function stopNoise(){

  synth.triggerRelease()

}

​