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              <div id="visualizations">
  <div class="margin"></div>
  <div class="vis">
  <button id="mute-0" class="mute-button"></button>
  <button id="unmute-0" class="unmute-button" style="display: none"></button>     
  <button id="regen-0">&#8635;</button>
  <div id="vis-0" class="notes"></div>
  </div>
  <div class="space"></div>
  <div class="vis">
    <button id="mute-1" class="mute-button"></button>
    <button id="unmute-1" class="unmute-button" style="display: none"></button> 
    <button id="regen-1">&#8635;</button>
    <div id="vis-1" class="notes"></div>
  </div>
  <div class="space"></div>
  <div class="vis">
    <button id="mute-2" class="mute-button"></button>
    <button id="unmute-2" class="unmute-button" style="display: none"></button> 
    <button id="regen-2">&#8635;</button>
    <div id="vis-2" class="notes"></div>
  </div>
  <div class="margin"></div>
</div>
            
          
!
            
              html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  background-color: #BBDEFB;
}

#visualizations {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}


button {
  border-radius: 50%;
  width: 100px;
  height: 100px;
  margin: 0;
  border: 0;
  font-size: 40px;
  outline: none;
  cursor: pointer;
  background-color: #BBDEFB;
}
button:hover {
  background-color: #E3F2FD;
}
.mute-button, .unmute-button {
  background-size: contain;
  background-repeat: no-repeat;
  background-position: 50% 50%;
}
.mute-button {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/mute.svg');
}
.unmute-button {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/unmute.svg');
}
button:last-of-type {
  margin-right: 50px;
}

#visualizations {
  display: flex;
  flex-direction: column;
}
.vis {
  flex: 2;
  padding: 0 100px;
  display: flex;
  align-items: stretch;
  flex-direction: row;
}
.margin {
  flex: 2;
}
.space {
  flex: 0.5;
}
.vis button {
  align-self: center;
}
.notes {
  display: flex;
  align-items: stretch;
}
.note {
  position: relative;
}
.note .main {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
}
.note .symbol {
  flex: 1;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: 0% 50%;
}
.note .progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background-color: #EC407A;
}
.note.d-4n {
  width: 120px;
}
.note.d-8n {
  width: 60px;
}
.note.d-4n .symbol {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/4n.svg');
}
.note.d-8n .symbol {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/8n.svg');
}
.note.r.d-4n .symbol {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/4r.svg'); 
}
.note.r.d-8n .symbol {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/8r.svg');
}
.note.l .symbol {
  height: 80px;
}
.note.m .symbol {
  height: 100px;
}
.note.h .symbol {
  height: 120px;
}
.note.r .symbol {
  height: 60px;
}
            
          
!
            
              const c3 = new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/xylo-c3.mp3');
const g3 = new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/xylo-g3.mp3');
const c4 = new Tone.Buffer('https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/street-bell-c4.mp3');
const sounds = {
  c3: {
    h: { buffer: c3, duration: 1, offset: 0 },
    l: { buffer: c3, duration: 1, offset: 1 },
    m: { buffer: c3, duration: 1, offset: 2 }
  },
  g3: {
    h: { buffer: g3, duration: 1, offset: 0 },
    l: { buffer: g3, duration: 1, offset: 1 },
    m: { buffer: g3, duration: 1, offset: 2 }
  },
  c4: {
    h: { buffer: c4, duration: 1, offset: 0 },
    l: { buffer: c4, duration: 1, offset: 1 },
    m: { buffer: c4, duration: 1, offset: 2 }
  }
};

const grammar = tracery.createGrammar({
  pattern: ['#cell# #pattern#', '#cell#'],
  cell: ['#two#', '#three#'],
  two: ['#eighth# #eighth#', '#quarter#'],
  three: [
    '#eighth# #eighth# #eighth#',
    '#quarter# #eighth#',
    '#eighth# #quarter#'
  ],
  quarter: ['h-4n', 'l-4n', 'm-4n', 'r-4n'],
  eighth: ['h-8n', 'l-8n', 'm-8n', 'r-8n']
});

const loops = [
  {
    pan: -0.25,
    pitch: 'c4',
    gain: 0.7,
    pattern: generatePattern(grammar),
    vis: initVis(0)
  },
  {
    pan: 0,
    pitch: 'g3',
    gain: 0.6,
    pattern: generatePattern(grammar),
    vis: initVis(1)
  },
  {
    pan: 0.25,
    pitch: 'c3',
    gain: 0.9,
    pattern: generatePattern(grammar),
    vis: initVis(2)
  }
];

function generatePattern(grammar) {
  const pattern = grammar.expand('#pattern#');

  const notes = [];
  let totalDuration = '0';
  pattern.children.forEach(function visit(node) {
    if (node.children) {
      node.children.forEach(visit);
    } else if (node.raw.trim().length) {
      const [velocity, duration] = node.raw.split('-');
      notes.push({ velocity, duration, node });
      totalDuration += '+' + duration;
    }
  });
  return { pattern, notes, totalDuration };
}

Tone.Buffer.on('load', () => {
  const masterGain = new Tone.Gain(0).toMaster();
  const compressor = new Tone.Compressor().connect(masterGain);
  const delay = new Tone.Delay(0.2).connect(compressor);
  masterGain.gain.setValueAtTime(0, Tone.now());
  masterGain.gain.linearRampToValueAtTime(1, Tone.now() + 1.5);

  loops.forEach(({ pattern, pitch, pan, gain, vis }, loopIndex) => {
    const muteGain = new Tone.Gain(1).connect(delay);
    const panner = new Tone.Panner(pan).connect(muteGain);
    const player = new Tone.MultiPlayer().connect(panner);

    renderPattern(pattern, vis, loopIndex);

    const regenButton = document.querySelector(`#regen-${loopIndex}`);
    const muteButton = document.querySelector(`#mute-${loopIndex}`);
    const unmuteButton = document.querySelector(`#unmute-${loopIndex}`);

    regenButton.addEventListener('click', () => {
      pattern = generatePattern(grammar);
      renderPattern(pattern, vis, loopIndex);
    });
    unmuteButton.style.display = 'none';
    muteButton.addEventListener('click', () => {
      muteGain.gain.setValueAtTime(1, Tone.now());
      muteGain.gain.linearRampToValueAtTime(0, Tone.now() + 0.3);
      muteButton.style.display = 'none';
      unmuteButton.style.display = 'block';
      vis.container.style.opacity = 0.3;
    });
    unmuteButton.addEventListener('click', () => {
      muteGain.gain.setValueAtTime(0, Tone.now());
      muteGain.gain.linearRampToValueAtTime(1, Tone.now() + 0.3);
      muteButton.style.display = 'block';
      unmuteButton.style.display = 'none';
      vis.container.style.opacity = 1;
    });

    function playPattern(baseTime = Tone.now()) {
      // Play each note in pattern once
      let time = baseTime;
      pattern.notes.forEach((note, soundIdx) => {
        const humanize = Math.random() * 0.02 - 0.01;
        if (sounds[pitch].hasOwnProperty(note.velocity)) {
          const { buffer, offset, duration: sampleDur } = sounds[pitch][
            note.velocity
          ];
          player.start(buffer, time + humanize, offset, sampleDur, 0, gain);
        }
        Tone.Draw.schedule(() => renderPlay(note, vis), time + humanize);
        time += '+' + note.duration;
      }, baseTime);
      // Schedule next iteration
      Tone.Transport.schedule(playPattern, '+' + pattern.totalDuration);
    }
    Tone.Transport.schedule(playPattern);
  });

  Tone.Transport.bpm.value = 120;
  Tone.Transport.start();
});

function initVis(loopIndex) {
  return {
    container: document.querySelector(`#vis-${loopIndex}`),
    noteElements: new Map()
  };
}
function renderPattern(pattern, { container, noteElements }, loopIndex) {
  const fadeDelay = 250;
  const removals = [];
  for (const [note, el] of noteElements) {
    removals.push(
      new Promise(res => {
        el.animate([{ opacity: 1 }, { opacity: 0 }], {
          duration: fadeDelay,
          fill: 'forwards'
        }).onfinish = () => {
          el.remove();
          res();
        };
      })
    );
    noteElements.delete(note);
  }
  const addedEls = pattern.notes.map(note => {
    const noteEl = document.createElement('div');
    noteEl.classList.add('note');
    noteEl.classList.add(note.velocity);
    noteEl.classList.add(`d-${note.duration}`);
    const mainEl = document.createElement('div');
    mainEl.classList.add('main');
    const symbolEl = document.createElement('div');
    symbolEl.classList.add('symbol');
    mainEl.appendChild(symbolEl);
    noteEl.appendChild(mainEl);
    const progressEl = document.createElement('div');
    progressEl.classList.add('progress');
    noteEl.appendChild(progressEl);
    container.appendChild(noteEl);
    noteElements.set(note, noteEl);
    noteEl.style.opacity = 0;
    return noteEl;
  });
  Promise.all(removals).then(() => {
    addedEls.forEach(el =>
      el.animate([{ opacity: 0 }, { opacity: 1 }], {
        delay: fadeDelay,
        duration: fadeDelay,
        fill: 'forwards'
      })
    );
  });
}
function renderPlay(noteToPlay, { noteElements }) {
  let playedSeen = false;
  let lastPlayed = true;
  for (const [note, el] of noteElements) {
    if (noteToPlay === note) {
      playedSeen = true;
      bounce(el.querySelector('.symbol'));
      el
        .querySelector('.progress')
        .animate([{ width: 0, opacity: 0 }, { width: '100%', opacity: 1 }], {
          duration: 300,
          fill: 'forwards'
        });
      lastPlayed = true;
    } else {
      lastPlayed = false;
    }
  }
  if (lastPlayed) {
    for (const [note, el] of noteElements) {
      el.querySelector('.progress').animate([{ opacity: 1 }, { opacity: 0 }], {
        delay: 200,
        duration: 100,
        fill: 'forwards'
      });
    }
  }
}

function bounce(el) {
  dynamics.animate(
    el,
    { translateY: 15 },
    {
      type: dynamics.spring,
      duration: 1,
      friction: 200,
      frequency: 300,
      complete: () =>
        dynamics.animate(
          el,
          { translateY: 0 },
          {
            type: dynamics.spring,
            duration: 1000,
            friction: 200,
            anticipationSize: -20,
            anticipationStrength: 310,
            frequency: 300
          }
        )
    }
  );
}

StartAudioContext(Tone.context, document.documentElement);

            
          
!
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