let amp;

let button;

​

let volhistory = [];

​

function toggleSong() {

  if (song.isPlaying()) {

    song.pause();

  } else {

    song.play();

  }

}

​

function preload() {

  song = loadSound ('Mysong.mp3');

}

​

​

function setup() {

  createCanvas(200, 200);

  angleMode(DEGREES);

  button = createButton('toogle');

  button.mousePressed(toggleSong);

  song.play();

  amp = new P5.Amplitude();

}

​

function draw() {

  background(0);

  let vol = amp.getLevel();

  volhistory.push(vol);

  stroke(255);

  noFill();

  translate(width / 2, height / 2);

  beginShape();

  for (let i= 0; i < 360; i++) {

    let r = map(volhistriy[i], 0,1,10,100);

    let x = r * cos(i);

    let y = r * sin(i);

    vertex(x, y);

  }

  endShape();

  if(volhistory.length >360) {

    volhistory.splice(0, 1);

  }

}