Delay Effect with Web Audio API

delay.js

var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var streamNode;
var masterNode;
var bypassNode;
var delayNode;
var feedbackNode;

//request an audio MediaStream track and save a reference to it
navigator.mediaDevices.getUserMedia({audio: true})
.then(stream => {

  //create an audio node from the stream
  streamNode = audioCtx.createMediaStreamSource(stream);
  delayNode = audioCtx.createDelay(100)
  feedbackNode = audioCtx.createGain();
  bypassNode = audioCtx.createGain();
  masterNode = audioCtx.createGain();

  //controls
  delayNode.delayTime.value = 1;
  feedbackNode.gain.value = 0.8;
  bypassNode.gain.value = 1;

  //wire up nodes
  streamNode.connect(delayNode);
  delayNode.connect(feedbackNode);
  feedbackNode.connect(delayNode);

  delayNode.connect(bypassNode);
  bypassNode.connect(masterNode);
  streamNode.connect(masterNode);

  masterNode.connect(audioCtx.destination);
})

.catch(e => console.log(e));