css Audio - Active file-generic CSS - Active Generic - Active HTML - Active JS - Active SVG - Active Text - Active file-generic Video - Active header Love html icon-new-collection icon-person icon-team numbered-list123 pop-out spinner split-screen star tv

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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.

            
              <div class="keyboard">
  <div class="keyboard__row">
    <kbd class="keyboard__key keyboard__key--81">Q</kbd>
    <kbd class="keyboard__key keyboard__key--87">W</kbd>
    <kbd class="keyboard__key keyboard__key--69">E</kbd>
    <kbd class="keyboard__key keyboard__key--82">R</kbd>
    <kbd class="keyboard__key keyboard__key--84">T</kbd>
    <kbd class="keyboard__key keyboard__key--89">Y</kbd>
    <kbd class="keyboard__key keyboard__key--85">U</kbd>
    <kbd class="keyboard__key keyboard__key--73">I</kbd>
    <kbd class="keyboard__key keyboard__key--79">O</kbd>
    <kbd class="keyboard__key keyboard__key--80">P</kbd>
    <kbd class="keyboard__key keyboard__key--219">[</kbd>
    <kbd class="keyboard__key keyboard__key--221">]</kbd>
  </div>
  <div class="keyboard__row">
    <kbd class="keyboard__key keyboard__key--65">A</kbd>
    <kbd class="keyboard__key keyboard__key--83">S</kbd>
    <kbd class="keyboard__key keyboard__key--68">D</kbd>
    <kbd class="keyboard__key keyboard__key--70">F</kbd>
    <kbd class="keyboard__key keyboard__key--71">G</kbd>
    <kbd class="keyboard__key keyboard__key--72">H</kbd>
    <kbd class="keyboard__key keyboard__key--74">J</kbd>
    <kbd class="keyboard__key keyboard__key--75">K</kbd>
    <kbd class="keyboard__key keyboard__key--76">L</kbd>
    <kbd class="keyboard__key keyboard__key--186">;</kbd>
    <kbd class="keyboard__key keyboard__key--222">'</kbd>
    <kbd class="keyboard__key"></kbd>
  </div>
  <div class="keyboard__row">
    <kbd class="keyboard__key keyboard__key--90">Z</kbd>
    <kbd class="keyboard__key keyboard__key--88">X</kbd>
    <kbd class="keyboard__key keyboard__key--67">C</kbd>
    <kbd class="keyboard__key keyboard__key--86">V</kbd>
    <kbd class="keyboard__key keyboard__key--66">B</kbd>
    <kbd class="keyboard__key keyboard__key--78">N</kbd>
    <kbd class="keyboard__key keyboard__key--77">M</kbd>
    <kbd class="keyboard__key keyboard__key--188">,</kbd>
    <kbd class="keyboard__key keyboard__key--190">.</kbd>
    <kbd class="keyboard__key keyboard__key--191">/</kbd>
    <kbd class="keyboard__key"></kbd>
    <kbd class="keyboard__key"></kbd>
  </div>
</div>

<div>
  <canvas></canvas>
</div>
            
          
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              body {
  background: #000;
  font-family: sans-serif;
  color: white;
}

.keyboard__row {
  display: flex;
}

.keyboard__key {
  display: block;
  height: 60px;
  width: 12.5%;
  flex-grow: 1;
  text-align: center;
  line-height: 60px;
  font-family: sans-serif;
  font-size: 24px;
  margin: 5px;
  border-radius: 5px;
  background: #333;
}

.keyboard__key.is-down {
  background: #8AF;
  color: white;
}

            
          
!
            
              // .~•* BLESS THIS MESS *•~. //

// go to line 284 and try out other sounds

// adjust note envelope, time in seconds
var attackTime = 1.0;
var releaseTime = 1.0;

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', // /

};


/* globals keyCodeNotes */


function Tone( voice, keyCode ) {
  this.voice = voice;
  this.audio = voice.audio;
  var osc = this.audio.createOscillator();
  var noteName = this.noteName = keyCodeNotes[ keyCode ];
  osc.frequency.value = getFrequency( noteName, voice.octaveOffset );
  osc.type = voice.type;
  osc.detune.value = voice.detune;

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

  osc.connect( gain );
  osc.start();
  gain.connect( voice.output );

  this.osc = osc;
  this.gain = gain;
  
  this.isKeyDown = false;
}

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, octaveOffset ) {
  var note = noteName[0];
  var octave = noteName[1];
  var semitone = semitoneMap[ note ] + ( octave - 4 + octaveOffset ) * 12;
  return 440 * Math.pow( PIANO_BASE, semitone );
}

var proto = Tone.prototype;


proto.rampGain = function( value, duration ) {
  var now = this.audio.currentTime;
  var currentValue = this.getCurrentGainValue( now );

  this.gain.gain.cancelScheduledValues( now );
  this.gain.gain.setValueAtTime( currentValue, now );
  this.gain.gain.linearRampToValueAtTime( value, now + duration );

  this.gainRamp = {
    then: now,
    duration: duration,
    from: currentValue,
    to: value
  };

};

proto.getCurrentGainValue = function( now ) {
  var gainRamp = this.gainRamp;
  if ( !gainRamp ) {
    return 0;
  }
  // calc duration since last, decimal 0..1
  var rampDuration = Math.min( 1, ( now - gainRamp.then ) / gainRamp.duration );
  return lerp( gainRamp.from, gainRamp.to, rampDuration );
};

function lerp( a, b, t ) {
  return ( b - a ) * t + a;
}

// -----  ----- //

proto.keyDown = function() {
  if ( this.isKeyDown ) {
    return;
  }
  this.rampGain( this.voice.volume, attackTime );
  // this.gain.gain.value = this.voice.volume;
  this.isKeyDown = true;
};

proto.keyUp = function() {
  // this.gain.gain.value = 0;
  this.rampGain( 0, releaseTime );
  this.isKeyDown = false;
};


/* globals keyCodeNotes, Tone */

function Voice( audio, output, options ) {
  // apply options
  for ( var prop in options ) {
    this[ prop ] = options[ prop ];
  }
  this.audio = audio;
  this.output = output;
  this.createTones();
}

var proto = Voice.prototype;

proto.octaveOffset = 0;
proto.type = 'triangle';
proto.volume = 1;
proto.detune = 0;

proto.createTones = function() {
  // tones are per keyboard key
  this.tones = {};
  this.onTones = {};

  for ( var keyCode in keyCodeNotes ) {
    var tone = new Tone( this, keyCode );
    this.tones[ keyCode ] = tone;
  }

};

proto.keyDown = function( keyCode ) {
  this.doTone( keyCode, 'keyDown' );
};

proto.keyUp = function( keyCode ) {
  this.doTone( keyCode, 'keyUp' );
};

proto.doTone = function( keyCode, method ) {
  var tone = this.tones[ keyCode ];
  if ( tone ) {
    tone[ method ]();
  }
};


/* globals keyCodeNotes, Voice */

var AudioCtx = window.AudioContext || window.webkitAudioContext;

// -----  ----- //

function Instrument() {
  this.voices = [];
  document.addEventListener( 'keydown', this );
  document.addEventListener( 'keyup', this );
  this.audio = new AudioCtx();
  // output
  this.output = this.audio.createGain();
  this.output.gain.value = 1;
  this.output.connect( this.audio.destination );
}

var proto = Instrument.prototype;

// ----- events ----- //

proto.handleEvent = function( event ) {
  var handler = this[ 'on' + event.type ];
  if ( this[ 'on' + event.type ] ) {
    handler.call( this, event );
  }
};

proto.onkeydown = function( event ) {
  if ( event.keyCode == 91 ) {
    this.isCmdDown = true;
  }
  if ( this.isCmdDown ) {
    return;
  }

  this.keyDown( event.keyCode );
};

proto.onkeyup = function( event ) {
  if ( event.keyCode == 91 ) {
    this.isCmdDown = false;
  }
  this.keyUp( event.keyCode );
};

// ----- play/stop note ----- //

proto.keyDown = function( keyCode ) {
  var noteName = keyCodeNotes[ keyCode ];
  if ( !noteName ) {
    return;
  }
  changeKeyElemDown( keyCode, 'add' );
  this.voices.forEach( function( voice ) {
    voice.keyDown( keyCode );
  });

};

proto.keyUp = function( keyCode ) {
  var noteName = keyCodeNotes[ keyCode ];
  if ( !noteName ) {
    return;
  }
  changeKeyElemDown( keyCode, 'remove' );
  this.voices.forEach( function( voice ) {
    voice.keyUp( keyCode );
  });
};

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

function changeKeyElemDown( keyCode, method ) {
  var keyElem = keyboardElem.querySelector( '.keyboard__key--' + keyCode );
  keyElem.classList[ method ]('is-down');
}

// ----- addVoice ----- //

// shape, volume, detune, octave offset
proto.addVoice = function( options ) {
  options = options || {};
  var voice = new Voice( this.audio, this.output, options );
  this.voices.push( voice );
};

//-----------------------

var synth = new Instrument();

/**/
// buzzy
synth.addVoice({
  type: 'square',
  volume: 0.1
});

synth.addVoice({
  type: 'square',
  volume: 0.1,
  octaveOffset: -1,
  detune: -5
});
/**/

/** /
// holy
synth.addVoice({
  type: 'sine',
  volume: 0.2
});

synth.addVoice({
  type: 'sine',
  volume: 0.2,
  detune: -5
});

synth.addVoice({
  type: 'sine',
  volume: 0.2,
  detune: -10
});

synth.addVoice({
  type: 'sine',
  volume: 0.2,
  detune: 7
});

synth.addVoice({
  type: 'sine',
  volume: 0.2,
  detune: 5
});
/**/

/** /
// organ
synth.addVoice({
  volume: 0.5
});

synth.addVoice({
  octaveOffset: -1,
  volume: 0.3
});

synth.addVoice({
  octaveOffset: 1,
  volume: 0.3
});
/**/


//-----------------------

var canvas = document.querySelector('canvas');
var canvasWidth = canvas.width = window.innerWidth - 40;
var canvasHeight = canvas.height = 300;
var ctx = canvas.getContext('2d');

var analyzer = synth.audio.createAnalyser();
synth.output.connect(  analyzer );

analyzer.minDecibels = -90;
analyzer.maxDecibels = -10;
analyzer.smoothingTimeConstant = 0.85;

analyzer.fftSize = 512;
var bufferLength = analyzer.frequencyBinCount;
var dataArray = new Uint8Array( bufferLength );


ctx.fillStyle = 'white';
ctx.fillRect( 0, 0, canvasWidth, canvasHeight );

function render() {
  analyzer.getByteFrequencyData( dataArray );

  // shift down
  var canvasImageData = ctx.getImageData( 0, 0, canvasWidth, canvasHeight );
  ctx.putImageData( canvasImageData, 0, 6 );

  ctx.fillStyle = 'black';
  ctx.fillRect( 0, 0, canvasWidth, canvasHeight );

  var barWidth = Math.ceil( canvasWidth / bufferLength);

  for ( var i = 0; i < bufferLength; i++ ) {
    var x = Math.floor( i * barWidth );
    var amp = dataArray[i] / 200; // should be 256
    var hue = Math.round( amp * 210 + 210 );
    var sat = 50 + ( 1- amp) * 50;
    var alpha = amp
    ctx.fillStyle = 'hsla(' + hue + ', 100%, ' + 50 + '%, ' + 1 + ')';
    var barHeight = amp * canvasHeight;
    var y = canvasHeight - barHeight;
    ctx.fillRect( x, y, barWidth, barHeight );
  }
  
  requestAnimationFrame( render );
}

render();




            
          
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