let xCurrentPos = 0;

​

function setup() {

  createCanvas(600, 400);

  mic = new p5.AudioIn(); // make audio in object

  mic.start(); // start the mic

  background(255); // draw background once

}

​

function draw() {

  let micLevel = mic.getLevel();

  if(xCurrentPos > width){

    background(255);

    xCurrentPos = 0;

  }

  noFill();

  let strokeRed = 255;

  let strokeBlue = 255;

  strokeRed = map(micLevel, 0, 1, 0, 255);

  stroke(strokeRed, 0, strokeBlue);

  const yStart = height;

  //const yLineHeight = micLevel * height;

  const yLineHeight = map(micLevel, 0, 0.5, 0, height);

  const yEnd = yStart - yLineHeight;

  line(xCurrentPos, yStart, xCurrentPos, yEnd);

  xCurrentPos = xCurrentPos + 1;

}