let mic;

​

function setup() {

  createCanvas(200, 200);

 wave = new p5.Oscillator();

  wave.setType('sine');

   wave.start();

  wave.amp(0.2);

  wave.freq(440);

  mic = new p5.AudioIn();

  mic.start();

  fft = new p5.FFT(0.5, 512);

  fft.setInput(mic);

}

​

function draw() {

  background(220);

  var vol = mic.getLevel();

   let bins = fft.analyze();

  for (let i = 0; i < bins.length; i++) {

    let drawY = map(i, 0, bins.length, 0, height);

   let val = bins[i];

   let rectWidth = map(val, 0, 255, 0, width);

  let rectHeight = height / bins.length;

   wave.freq(map(vol*200, 0, 200, 100, 1000), 0.1);

     //wave.amp(map(mouseY, 0, vol, 0, 0.5));

  fill('pink');

  rect(0, drawY, rectWidth, rectHeight);

 }

}