cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

            
              <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>
            
          
!
            
              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;
  }
}

            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.
Loading ..................

Console