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HTML

              
                <main>
  <section id="entertainment">
    <div id="faces"></div>
    <div id="chano"><div><div><div></div></div></div></div>
  </section>    
  <section id="sequencer">
    <div id="sequence"></div>
    <nav class="controls">
      <ul>
        <li>
          <input id="bpm" type="range" min="80" max="140" />
        </li>
        <li>
          <button id="go">Start</button>
        </li>
      </ul>
    </nav>
  </section>
</main>    
              
            
!

CSS

              
                $cols: 16;
$rows: 4;
$frame-h: 463px;
$frame-w: 300px;
$frame-count: 13;
$node-bg-di: 118px;
$row-h: $node-bg-di;
$asset-root: "https://s3-us-west-2.amazonaws.com/s.cdpn.io/111863/";
$mobile-w: 668px;
$c-bg: #101010;
$c-primary: #D79C57;
$c-primary-d: darken($c-primary, 10%);
$c-secondary: #996888;
$c-material: #444;
$c-material-xl: lighten($c-material, 15%);
$c-material-l: lighten($c-material, 5%);
$c-material-d: darken($c-material, 5%);
$c-material-xd: darken($c-material, 10%);
$c-material-xxd: darken($c-material, 15%);
$c-border: rgba(0,0,0,0.35);
$c-border: $c-material-xxd;

html, body { 
  height: 100%; 
  min-height: 422px;
}

main {
  width: 100%;
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
}

section {
  margin: 0 auto;
}

button {
  appearance: none;
  color: white;
  background: $c-primary;
  border: none;
  border-radius: 4px;
  text-shadow: -1px -1px 0px $c-primary-d;
  border: 1px solid $c-primary-d;
  &:hover {
    background: $c-primary-d;
  }
}

.mobile-start {
  position: fixed;
  top: 0; right: 0; bottom: 0; left: 0;
  background: rgba(0,0,0,0.9);
  button {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    padding: 2rem 2rem;
  }
}

#entertainment { 
  padding: 0 0 1rem 0;
  width: 150px;
  height: 150px;
  @media (min-width: $mobile-w) {
    width: 300px;
    height: 300px;
  }
  position: relative;
  #chano, #faces { 
    position: absolute; 
  }  
}

#sequencer {
  width: 90%;
  max-width: 1200px;
  padding: 0.25rem;
  background: $c-material-xd;
  border-radius: 4px;
  box-shadow: 0px 2px 0px 2px $c-material-xxd;
  
  ul {
    border-radius: 4px;
    list-style: none;
    margin: 0.25rem 0 0;
    padding: 0.5rem;
    text-align: center;
    background: $c-material-d;
    border: 1px solid $c-border;
    li {
      display: inline-block;
      margin: 0;
      + li { margin-left: 1rem; }
      label {
        display: block;
      } 
    }
  }
  button {
    box-sizing: border-box;
    padding: 0.5rem 0;
  }
  button, input {
    width: 100px;
  }
}

#faces {
  display: flex;
  flex-wrap: wrap;
  width: 100%;
  position: relative;
  box-sizing: border-box;
  background: $c-material-xd;
  box-shadow: 0px 2px 0px 2px $c-material-xxd;  
  border-radius: 4px;
  padding: 0.5rem;
  
  div:nth-child(1) { border-radius: 4px 0 0 0; }
  div:nth-child(2) { border-radius: 0 4px 0 0; }
  div:nth-child(3) { border-radius: 0 0 0 4px; }
  div:nth-child(4) { border-radius: 0 0 4px 0; }
  
  [class^="face-"] {
    width: 50%;
    position: relative;
    cursor: pointer;
    overflow: hidden;
    &::before {
      display: block;
      content: "";
      width: 100%;
      padding-top: 100%;
    }
    &::after {
      content: "";
      cursor: pointer;
      position: absolute;
      top: 0; left: 0; bottom: 0;
      width: 100%;
      background-size: cover;
      filter: grayscale(1);
    }
    &:hover::after {
      filter: grayscale(0);
    }
  }
}

// the sequencer rows
[class^="row-"] {
  width: 100%;
  display: flex;
  box-sizing: border-box;
  border-bottom: 1px solid $c-border;
  border-right: 1px solid $c-border;
  border-left: 1px solid $c-border;
  overflow: hidden;
  transform: translateZ(0);
  
  &:first-child {
    border-top: 1px solid $c-border;
    border-radius: 4px 4px 0 0;
  } 
  &:last-child {
    border-radius: 0 0 4px 4px;
  }
  
  span {
    position: relative;
    display: block;
    box-sizing: border-box;
    width: 1 / $cols * 100%;
    cursor: pointer;
    overflow: hidden;
    background: $c-material-d;
    transform: translateZ(0);
    
    &::before {
      content: "";
      display: block;
      width: 100%;
      padding-top: 100%;
    }
    
    + span {
      border-left: 1px solid $c-border;
    }
    
    &:nth-child(n+5):not(:nth-child(n+9)),
    &:nth-child(n+13) {
      background: $c-material-l;
    }
    
    &::after {
      content: "";
      position: absolute;
      top: 0; left: 0; bottom: 0;
      width: 100%;
      background-size: cover;
      border: 1px solid $c-border;

      transform-origin: 50% 50%;
      @media (min-width: $mobile-w) {
        transition: transform 70ms ease-in-out,
          filter 70ms ease-in-out,
          border-radius 100ms ease-in-out;
      }        
    }
    
    &[data-val="1"] {
      &::after {
        opacity: 0.8;
        transform: scale(1.05) translateZ(0);
        filter: grayscale(0);
        border: none;
        border-radius: 0px;
      }
    }
    &[data-val="0"] {
      &::after {
        opacity: 0.6;        
        transform: scale(0.8) translateZ(0);
        filter: grayscale(1);
        border-radius: 50%;
      }
    }
    
    &:hover {
      background: $c-material-xl!important;
      &::after {
        opacity: 1;
      }
    }
  }
}

@for $row from 1 through $rows {
  [class^="face-#{$row - 1}"]::after,
  [class^="row-#{$row - 1}"] span::after {
    background-image: url(#{$asset-root}chance-the-sampler-face-#{$row}.jpg);
  }
}

@for $col from 1 through $cols {
  #faces[class*="#{$col - 1}"] .face-#{$col - 1}::after {
    background-position: -100% center;
    filter: grayscale(0);
  }
  .current-#{$col - 1} [data-col="#{$col - 1}"] {
    @media (min-width: $mobile-w) {
      &, &:hover { background: rgba(255,255,255,0.4)!important; }
    }
    &::after {
      opacity: 1!important;
    }
    
    &[data-val="1"] {
      &::after {
        background-position: -100% center;
      }        
    }
  }
}

#chano div { 
  display: none;
  @media (min-width: $mobile-w) {
    .box-reflect & {
      display: block;
      position: absolute;
      transform: translate(-100%, -50%) scale(0.5) rotate(15deg);
      -webkit-box-reflect: above;
    }
  }
}

#chano {
  transform: translate(-50%, -50%);
  @media (min-width: $mobile-w) {
    html:not(.box-reflect) & {
      display: none;      
    }
    .box-reflect & {
      transform: translate(-300px, -50%);
      -webkit-box-reflect: right 300px;
    }      
  }    
}

:not(.mobile) #chano div,
#chano {
  top: 50%;
  left: 50%;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1000ms;  
  .playing & { opacity: 1; }
  &::after {
    content: "";
    display: block;
    background-image: url("#{$asset-root}chance-the-sprite.png");
    height: $frame-h / 4;
    width: $frame-w / 4;
    background-size: ($frame-w/4) * $frame-count ($frame-h/4);
    @media (min-width: $mobile-w) {
      height: $frame-h / 2;
      width: $frame-w / 2;
      background-size: ($frame-w/2) * $frame-count ($frame-h/2);
    }
  }  
}
@for $i from 1 through $frame-count {
  #chano.frame-#{$i} div::after,
  #chano.frame-#{$i}::after {
    $x: ($i - 1) / ($frame-count) * ($frame-w / 4 * -$frame-count);
    background-position: $x center;
    @media (min-width: $mobile-w) {
      $x: ($i - 1) / ($frame-count) * ($frame-w / 2 * -$frame-count);
      background-position: $x center;
    }      
  }
}

body {
  color: white;
  background: $c-bg;
  // overflow: hidden;
  &::before {
    content: "";
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 0;
    background-size: cover;
    background-position: center;
    background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/111863/chance-the-sampler-bg.jpg);
    opacity: 0.1;
    filter: grayscale(1);
  }
  
  .box-reflect &.playing::before {
    animation: bg 1s ease-in-out alternate infinite;
  }
}

@for $i from 80 through 140 {
  html.bpm-#{$i}.box-reflect body::before {
    animation-duration: (1 / ($i / 60)) * 1s;
  }
}

@keyframes bg {
  from { transform: scale(1); }
  to   { transform: scale(1.05); }
}

              
            
!

JS

              
                console.clear();

/********************
Instantiate Chano
********************/

var chance = new Chano({
  bpm: 90,
  beats: 16,
  selectors: {
    bpm: "#bpm",
    go: "#go"
  }
});

chance.load.then(function(chano) {
  //chano.play();
  var sequence = new Sequence({
    sequence: "#sequence",
    faces: "#faces",
    chano: chano
  });
  
  var animation = new Animation({
    chano: "#chano",
    frames: 13
  });
  
  chano.update = function(time, col) {
    sequence.$seq.className = "current-" + col;
    sequence.$faces.className = "current-" + chano.actives.join("");
    setTimeout(function() {
      sequence.$faces.className = "";  
    }, 100 / chano.bpm * 64);
    animation.update();
  };
});

/********************
Chance the Sampler: Player
********************/

function Chano(params) {
  var C = {};
  
  init();
  
  return C;
  
  /***********
  initializer
  ***********/
  
  function init() {
    drawPlaceholder(); // better screengrab
    setParams();
    
    /*********
    instance.load.then(function(chano) { 
      // do whatever with chano
    });
    *********/
    C.is_mobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
    C.click_event = C.is_mobile ? "touchstart" : "click";
    if("-webkit-box-reflect" in document.body.style) {
      document.querySelector("html").className += "box-reflect ";
    }
      
    C.load = new Promise(function(resolve, reject) {
      // if mobile, this needs to be instantiated by a click.
      setMobile(go);
      
      function go() {
        var set_synth = setSynth();
        set_synth.then(function() {
          removePlaceholder();
          setDomValue();
          setMethods();
          setMatrix();
          setTransport();
          setEvents();
          resolve(C);
        });
      }
    });
  }
  
  /***********
  placeholder  
  ***********/
  
  function drawPlaceholder() {
    C.placeholder = document.createElement("div");
    C.placeholder.style.backgroundImage = "url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/111863/chance-the-sampler-screen.png')";
    C.placeholder.style.backgroundPosition = "center";
    C.placeholder.style.backgroundSize = "cover";
    C.placeholder.style.position = "fixed";
    C.placeholder.style.top = 0;
    C.placeholder.style.left = 0;
    C.placeholder.style.right = 0;
    C.placeholder.style.bottom = 0;
    document.body.appendChild(C.placeholder);
  }
  
  function removePlaceholder() {
    C.placeholder.remove();
  }
  
  /***********
  setters  
  ***********/
  
  function setMobile(callback) {
    // if mobile, we need to instantiate with a click
    if(C.is_mobile) {
      document.querySelector("html").className += "mobile ";
      var $element = document.createElement("div");
      $element.className = "mobile-start";
      document.body.appendChild($element);
      var $mobile_start = document.createElement("button");
      $mobile_start.innerHTML = "Launch";
      $mobile_start.addEventListener("touchend", function(e) {
        e.preventDefault();
        Tone.startMobile();
        $element.remove();
        callback();
      });
      $element.appendChild($mobile_start);
    } else {
      callback();
    }
  }
  
  function setParams() {
    C._set = {
      bpm: params.bpm || 90,
      beats: params.beats || 16
    }
    C._el = {
      $bpm: document.querySelector(params.selectors.bpm),
      $go: document.querySelector(params.selectors.go)
    }
  }
  
  function setDomValue() {
    C._el.$bpm.value = C._set.bpm;
  }
  
  function setSynth() {
    return new Promise(function(resolve, reject) {
      var root = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/111863/chance-the-sampler-";
      C.keys = new Tone.PolySynth(4, Tone.Sampler, {
        sd1: root + "01.mp3",
        hh1: root + "02.mp3",
        sd2: root + "03.mp3",
        kd1: root + "04.mp3",
      }, {
        "volume" : -5,
      }).toMaster();
      C.note_names = ["sd1", "hh1", "sd2", "kd1"];
      
      var count = 4;
      var loaded = 1;
      for(var i = 0; i < count; i++) {
        var buffer = new Tone.Buffer(root + "0" + (i+1) + ".mp3", function(){
          loaded++;
          if(loaded === count) {
            resolve("Audios Loaded");
          }
        });
      }
    });
  }
  
  function setMatrix() {
    C.matrix = [
      [1,0,0,1],
      [0,0,0,0],
      [1,0,0,0],
      [0,0,0,0],

      [1,1,0,0],
      [0,1,0,1],
      [1,1,0,0],
      [0,0,0,0],

      [0,0,0,1],
      [1,0,1,0],
      [0,0,0,1],
      [1,0,0,0],

      [0,0,0,0],
      [1,0,1,0],
      [0,0,0,1],
      [1,0,1,0]
    ];
  }
  
  function setTransport() {
    var arr = [];
    for(var i = 0; i < C._set.beats; i++) arr.push(i);
    C.loop = new Tone.Sequence(function(time, col) {
      C.actives = [];
      var column = C.matrix[col];
      for (var i = 0; i < 4; i++) {
        if (column[i] === 1) {
          C.actives.push(i);
          C.keys.triggerAttackRelease(C.note_names[i], "8n", time);
        }
      }
      C.update(time, col);
    }, arr, "16n");
    C.updateBpm(C._set.bpm);
    Tone.Transport.start();
  }
  
  function setMethods() {
    C.updateBpm = updateBpm;
    C.updateMatrix = updateMatrix;
    C.play = play;
    C.pause = pause;
    // provide update function
    C.update = function(time, col) {};
  }
  
  function setEvents() {
    C._el.$bpm.addEventListener("change", function(e) {
      C.updateBpm(e.target.value);
    });
    C._el.$go.addEventListener(C.click_event, togglePlay);
  }
  
  
  /***********
  events  
  ***********/
  
  function updateMatrix(col, row, value) {
    C.matrix[col][row] = value;
  }
  
  function updateBpm(bpm) {
    Tone.Transport.bpm.value = bpm;
    var $html = document.querySelector("html");    
    var bpm_class = $html.className.match("bpm-");
    $html.className = bpm_class ? $html.className.replace(/bpm-\d+/g,"bpm-"+bpm) : $html.className + "bpm-" + bpm;
    C.bpm = bpm;
  }
  
  function play() {
    C.loop.start();
    document.body.className = "playing";
    C.playing = true;
  }
  
  function pause() {
    C.loop.stop();
    document.body.className = "";
    C.playing = false;
  }
  
  function togglePlay(e) {
    if(C.playing) {
      C.pause();
      if(e && e.target) e.target.innerHTML = "Start";
    } else {
      C.play();
      if(e && e.target) e.target.innerHTML = "Stop";
    }
  }
  
}

/********************
Chance the Sampler: Sequencer
********************/

function Sequence(params) {
  var S = {};
  
  init();
  
  return S;
  
  /***********
  initializer
  ***********/
  
  function init() {
    setData();
    createElements();
  }
  
  /***********
  private
  ***********/
  
  function setData() {
    S.chano = params.chano;
    S.$seq = document.querySelector(params.sequence);
    S.$faces = document.querySelector(params.faces);
  }
  
  function createElements() {
    S.nodes = [];
    S.rows = [];
    for(var r = 0; r < S.chano.matrix[0].length; r++) {
      S.nodes.push([]);
      var $row = document.createElement("div");
      $row.className = "row-" + r;
      S.$seq.appendChild($row);
      S.rows.push($row);
    }
    
    for(var r = 0; r < S.chano.matrix[0].length; r++) {
      var $face = document.createElement("div");
      $face.className = "face-" + r;
      $face.setAttribute("data-key", r);
      S.$faces.appendChild($face);
      $face.addEventListener(S.chano.click_event, function(e) {
        var el = e.target;
        var key = parseInt(el.getAttribute("data-key"));
        S.$faces.className = "face-" + key;
        if(!S.chano.playing) {
          setTimeout(function() {
            S.$faces.className = "";
          }, 100);
        }
        var note = S.chano.note_names[key];
        S.chano.keys.triggerAttackRelease(note, "8n");
      });
    }      
    
    for(var c = 0; c < S.chano.matrix.length; c++) {
      var col = S.chano.matrix[c];
            
      for(var r = 0; r < col.length; r++) {
        var el = document.createElement("span");
        el.setAttribute("data-row", r);
        el.setAttribute("data-col", c);
        el.setAttribute("data-val", col[r]);
        el.addEventListener(S.chano.click_event, handleNodeClick);
        S.nodes[r].push(el);
        S.rows[r].appendChild(el);
      }
    }
  }
  
  function handleNodeClick(e) {
    var el = e.target,
        col = el.getAttribute("data-col"),
        row = el.getAttribute("data-row"),
        val = el.getAttribute("data-val");
    val = val === "1" ? 0 : 1;
    el.setAttribute("data-val", val);
    S.chano.updateMatrix(col, row, val);
  }
  
  
}


/********************
Chance the Sampler: Sprite Animation
********************/

function Animation(params) {
  var A = {};
  
  init();
  
  return A;
  
  /***********
  initialize
  ***********/
  
  function init() {
    setData();
    setUpdate();
  }
  
  /***********
  private
  ***********/
  
  function setData() {
    A.frame = 1;
    A.direction = "up";
    A.max_frame = params.frames;
    A.$chano = document.querySelector(params.chano);
  }
  
  function setUpdate() {
    A.update = function() {
      A.$chano.className = "frame-" + A.frame;
      if(A.frame === 1) {
        A.direction = "up";
        A.frame++;
      } else if(A.frame === A.max_frame) {
        A.direction = "down";
        A.frame--;        
      } else if(A.direction === "up") {
        A.frame++;
      } else {
        A.frame--;
      }
    }
  }
}



              
            
!
999px

Console