let mFilter;

let mAmp;

​

function preload() {

  mSound = loadSound("./epic-hip-hop.mp3");

}

​

function setup() {

  createCanvas(windowWidth, windowHeight);

​

  mFilter = new p5.Filter("bandpass");

  mFilter.res(4);

​

  mAmp = new p5.Amplitude();

​

  mSound.disconnect();

  mFilter.disconnect();

​

  mSound.connect(mFilter);

  mFilter.connect(p5.soundOut);

  mFilter.connect(mAmp);

​

  strokeWeight(2);

  stroke(0);

  noFill();

}

​

function draw() {

  background(220, 20, 120, 20);

​

  let mFreq = map(mouseX, 0, width, 50, 2000, true);

  mFilter.freq(mFreq);

​

  let d = map(mAmp.getLevel(), 0, 1, 5, height);

  ellipse(width / 2, height / 2, d, d);

}

​

function mouseClicked() {

  if (mSound.isPlaying()) {

    mSound.pause();

  } else {

    mSound.play();

  }

}