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              <div class="demo-container">
  <div class="start-message">CLICK TO START</div>
  <button type="button" name="button" class="button-color" id="filterButton">Click Me</button>
<div class="distance"></div>
              @import url(https://fonts.googleapis.com/css?family=Oswald|Merriweather);

body {
  background: #f2e0bd;
  font-family: "Oswald", Helvetica, Arial, sans-serif;

#filterButton {
  display: none;

.start-message {
  position: absolute;
  text-align: left;
  width: 100%;
  height: 150px;
  padding-top: 10px;
  padding-left: 10px;
  cursor: pointer;

var soundProximity = "Proximity";
var soundClick = "Click";
var $element = $("#filterButton");
var $distance = $(".distance");
var filterNode;
var filterMultiplier = 18; // how fast will filter adjust?
var filterOffset = 2500; // when will filter start adjusting?
var looping; // state for button event handling

function loadSounds() {
  createjs.Sound.on("fileload", handleLoad, this);
  // register sounds, which will preload automatically
  createjs.Sound.registerSound("https://s3.amazonaws.com/nrf-codepen-assets/drone.mp3", soundProximity);
  createjs.Sound.registerSound("https://s3.amazonaws.com/nrf-codepen-assets/water-drop.mp3", soundClick);

function handleLoad(evt) {

  // create filter in existing context, connect to context destination
  var context = createjs.Sound.activePlugin.context;
  filterNode = context.createBiquadFilter();
  filterNode.type = "lowpass";
  filterNode.frequency.value = 20000;

  // attach filter node to our existing dynamicsCompressorNode, which was connected to context.destination
  var dynamicsNode = createjs.Sound.activePlugin.dynamicsCompressorNode;

  // wrap our sound playing in a click event so we can be played on mobile devices

function revealDemo() {

  looping = true;
  $("#filterButton").click(handleButtonClick); // add button's event handler

  // proximity check
  function mousedistance(mX, mY) {

    var distance = calculateDistance($element, mX, mY);
    var filterValue = (filterOffset - (filterMultiplier * distance));
    filterNode.frequency.value = filterValue > 0 ? filterValue : 0;
    // testing code
    // $distance.text(distance);
  // add proximity-filter handler
  $(document).mousemove( function (e) {
    mousedistance(e.pageX, e.pageY);

function handleButtonClick(e) {
  e.stopImmediatePropagation();   // prevent double clicks
  if (looping) {
    // stopping the soundInstance doesn't seem to work when you have a filter node
    // connected - you have to stop everything.
    looping = false;
  } else {
    $element.text("Click Me");
    looping = true;

function startLoopPlayback() {
  filterNode.frequency.value = 200;
  createjs.Sound.play(soundProximity, {loop: 20});

function calculateDistance(elem, mouseX, mouseY) {
  return Math.floor(Math.sqrt(Math.pow(mouseX - (elem.offset().left + (elem
    .width() / 2)), 2) + Math.pow(mouseY - (elem.offset().top + (elem
    .height() / 2)), 2)));
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