let fft; // fft is = dividing sound into 1024 frequencies 

function setup() {

  createCanvas(1024, 400);

  mic = new p5.AudioIn();

  mic.start();

  fft = new p5.FFT();

  fft.setInput(mic);

}

​

function draw() {

  background(225);

  // let level = mic.getLevel();

  // if(level > 0.1) background(random(255));

  // ellipse(width/2,height/2, level *300, level * 100);

  let bins = fft.analyze();

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

    let bin = bins[b];

    line(b,height-bin,b,height);

  }

}