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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <p>Type 
  <select class="type-select">
    <option value="triangle">triangle</option>
    <option value="sine">sine</option>
    <option value="square">square</option>
    <option value="sawtooth">sawtooth</option>
  </select>
</p>

<div class="keyboard">
  <div class="keyboard__row">
    <kbd class="keyboard__key C5">Q</kbd>
    <kbd class="keyboard__key D5">W</kbd>
    <kbd class="keyboard__key E5">E</kbd>
    <kbd class="keyboard__key F5">R</kbd>
    <kbd class="keyboard__key G5">T</kbd>
    <kbd class="keyboard__key A5">Y</kbd>
    <kbd class="keyboard__key B5">U</kbd>
    <kbd class="keyboard__key C6">I</kbd>
  </div>
  <div class="keyboard__row">
    <kbd class="keyboard__key C4">A</kbd>
    <kbd class="keyboard__key D4">S</kbd>
    <kbd class="keyboard__key E4">D</kbd>
    <kbd class="keyboard__key F4">F</kbd>
    <kbd class="keyboard__key G4">G</kbd>
    <kbd class="keyboard__key A4">H</kbd>
    <kbd class="keyboard__key B4">J</kbd>
    <kbd class="keyboard__key C5">K</kbd>
  </div>
  <div class="keyboard__row">
    <kbd class="keyboard__key C3">Z</kbd>
    <kbd class="keyboard__key D3">X</kbd>
    <kbd class="keyboard__key E3">C</kbd>
    <kbd class="keyboard__key F3">V</kbd>
    <kbd class="keyboard__key G3">B</kbd>
    <kbd class="keyboard__key A3">N</kbd>
    <kbd class="keyboard__key B3">M</kbd>
    <kbd class="keyboard__key C4">,</kbd>
  </div>
</div>
            
          
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              body {
  background: #EEE;
  font-family: sans-serif;
}

.keyboard__row {
  display: flex;
}

.keyboard__key {
  display: block;
  height: 100px;
  width: 12.5%;
  flex-grow: 1;
  text-align: center;
  line-height: 100px;
  font-family: sans-serif;
  font-size: 30px;
  margin: 5px;
  border-radius: 5px;
  background: white;
}

.keyboard__key.is-down {
  background: #09F;
  color: white;
}

            
          
!
            
              var AudioCtx = window.AudioContext || window.webkitAudioContext;
var audio = new AudioCtx();

var semitoneMap = {
  C: -9,
  D: -7,
  E: -5,
  F: -4,
  G: -2,
  A: 0,
  B: 2,
};


var PIANO_BASE = Math.pow( 2, 1/12 );

/**
 * @param {String} noteName - note and octave: 'C4'
 */
function getFrequency( noteName ) {
  var note = noteName[0];
  var octave = noteName[1];
  var semitone = semitoneMap[ note ] + ( octave - 4 ) * 12;
  return 440 * Math.pow( PIANO_BASE, semitone );
}

var keyCodeNotes = {
  81: 'C5', // q
  87: 'D5', // w
  69: 'E5', // e
  82: 'F5', // r
  84: 'G5', // t
  89: 'A5', // y
  85: 'B5', // u
  73: 'C6', // i
  79: 'D6', // o
  80: 'E6', // p
  219: 'F6', // [
  221: 'G6', // ]

  65: 'C4', // a
  83: 'D4', // s
  68: 'E4', // d
  70: 'F4', // f
  71: 'G4', // g
  72: 'A4', // h
  74: 'B4', // j
  75: 'C5', // k
  76: 'D5', // l
  186: 'E5', // ;
  222: 'F5', // '

  90: 'C3', // z
  88: 'D3', // x
  67: 'E3', // c
  86: 'F3', // v
  66: 'G3', // b
  78: 'A3', // n
  77: 'B3', // m
  188: 'C4', // ,
  190: 'D4', // .
  191: 'E4', // /

};

// create tones
var tones = {};
for ( var keyCode in keyCodeNotes ) {
  var osc = audio.createOscillator();
  var noteName = keyCodeNotes[ keyCode ];
  osc.frequency.value = getFrequency( noteName );

  var gain = audio.createGain();
  gain.gain.value = 0;

  osc.connect( gain );
  osc.start();
  gain.connect( audio.destination );

  var tone = {
    noteName: noteName,
    osc: osc,
    gain: gain,
  };
  tones[ keyCode ] = tone;
}


document.addEventListener( 'keydown', function( event ) {
  var tone = tones[ event.keyCode ];
  if ( tone ) {
    tone.gain.gain.value = 1;
    event.preventDefault();
    changeKeyElemDown( tone.noteName, 'add' );
  }
});

document.addEventListener( 'keyup', function( event ) {
  var tone = tones[ event.keyCode ];
  if ( tone ) {
    tone.gain.gain.value = 0;
    event.preventDefault();
    changeKeyElemDown( tone.noteName, 'remove' );
  }
});

var keyboardElem = document.querySelector('.keyboard');

function changeKeyElemDown( noteName, method ) {
  var keyElems = keyboardElem.querySelectorAll( '.' + noteName );
  for ( var i=0; i < keyElems.length; i++ ) {
    keyElems[i].classList[ method ]('is-down');
  }
}

var typeSelect = document.querySelector('.type-select');
typeSelect.addEventListener( 'change', function() {
  changeType( typeSelect.value );
});
// set initial type
changeType( typeSelect.value );

function changeType( type ) {
  for ( var keyCode in tones ) {
    var tone = tones[ keyCode ];
    tone.osc.type = type;
  }
}

            
          
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