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HTML

              
                <h1>シャッフル</h1>
<ul id="pad">
   <li id="beat">Beat</li>
</ul>
              
            
!

CSS

              
                body {
  background: #333;
  font-family: sans-serif;
}

h1, p {
  color: #fff;
  text-align: center;
}

#pad {
  background: #333;
  padding: 10px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: 0 auto;
  position: relative;
}

li {
  margin: 5px;
  background: #666;
  border: 0px solid #333;
  width: 100px;
  height: 100px;
  line-height: 100px;
  border-radius: 5px;
  text-align: center;
  display: inline-block;
  color: #fff;
  box-shadow: 5px 5px 5px rgba(0,0,0, 0.3);
}

li:hover {
  opacity: 0.7;
}

.b_key {
  position: absolute;
  z-index: 10;
  top: 10px;
  margin: 0 -20px;
  padding: 0;
  background: #000;
  border: 1px solid #fff;
  color: #fff;
  width: 35px;
  height: 75px;
  text-align: center;
  display: inline-block; 
}

              
            
!

JS

              
                // DOM
const beat = document.querySelector('#beat');

// エンベロープ(キック)
let optsMembrane = {
  pitchDecay: 0.001,
  envelope: {
    attack: 0.001 ,
    decay: 0.75 ,
    sustain: 0.01 ,
    release: 0.01 
  },
  volume: 25
}

// エンベロープ(スネア)
let optsNoiseSnare = {
  envelope: {
    attack: 0.001 ,
    decay: 0.5 ,
    sustain: 0.01
  }
}

// エンベロープ(ハイハット)
let optsNoiseHihat = {
  type: "brown",
  envelope: {
    attack: 0.001 ,
    decay: 0.03 ,
    sustain: 0
  }
}

// シンセ生成
const membrane = new Tone.MembraneSynth(optsMembrane).toMaster();
const noise1 = new Tone.NoiseSynth(optsNoiseSnare).toMaster();
const noise2 = new Tone.NoiseSynth(optsNoiseHihat).toMaster();

// シンセ実行
const kick = () => {
  membrane.triggerAttackRelease('C0','2n'); 
};

const snare = () => {
  noise1.triggerAttackRelease('8n');
};

const hihat = () => {
  noise2.triggerAttackRelease('32n');
};

let beatNumber = 12;
let beatLength = 4 / beatNumber;

//リズム設定
let kickRhythm = [
  ['0:' + beatLength * 0 + ':0'],
  ['0:' + beatLength * 6 + ':0'],
];

let snareRhythm = [
  ['0:' + beatLength * 3 + ':0'],
  ['0:' + beatLength * 9 + ':0'],
];

let hihatRhythm = [];
for(i = 0; i < beatNumber ; i++) {
  if (i % 3 == 1) {
    console.log("noHihat: " + i);
  } else {
    hihatRhythm.push('0:' + beatLength * i + ':0');
  }
}

// シンセにリズムを設定
let kickPart = new Tone.Part(kick, kickRhythm).start();
let snarePart = new Tone.Part(snare, snareRhythm).start()
let hihatPart = new Tone.Part(hihat, hihatRhythm).start();

// ループ設定
kickPart.loop = true;
snarePart.loop = true;
hihatPart.loop = true;

// BPM設定
Tone.Transport.bpm.value = 100;

// クリックイベント
beat.addEventListener('click', () => {
  Tone.Transport.toggle();
}, false);



              
            
!
999px

Console