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HTML

              
                %h1 Click your fingers
%img.t{:src => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/217233/h8f0qj3aiz811.jpg'}
%img{:src => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/217233/thanos2.png'}
%img.hide{:src => 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/217233/thanos1.png'}

              
            
!

CSS

              
                img {
    position: absolute;
    left: 0;
    right: 0;
    margin: auto;
    top: 50%;
    transform: translateY(-50%);
}

.t {
    z-index: 120;
    width: 50px;;
    display: none;
    top: 70px
}

h1 {
    position: absolute;
    z-index: 10;
    font-family: georgia;
    text-align: center;
    width: 100%;
}
              
            
!

JS

              
                    var Recording = function(cb){
      var recorder = null;
      var recording = true;
      var audioInput = null;
      var volume = null;
      var audioContext = null;
      var callback = cb;
      navigator.getUserMedia = navigator.getUserMedia    || navigator.webkitGetUserMedia ||
                               navigator.mozGetUserMedia || navigator.msGetUserMedia;
      if(navigator.getUserMedia){
        navigator.getUserMedia({audio:true},
          function(e){ //success
            var AudioContext = window.AudioContext || window.webkitAudioContext;
            audioContext = new AudioContext();
            volume = audioContext.createGain(); // creates a gain node
            audioInput = audioContext.createMediaStreamSource(e); // creates an audio node from the mic stream
            audioInput.connect(volume);// connect the stream to the gain node
            recorder = audioContext.createScriptProcessor(2048, 1, 1);
            recorder.onaudioprocess = function(e){
                if(!recording) return;
                var left = e.inputBuffer.getChannelData(0);
                //var right = e.inputBuffer.getChannelData(1);
                callback(new Float32Array(left));
            };
            volume.connect(recorder);// connect the recorder
            recorder.connect(audioContext.destination);
          },
          function(e){ //failure
            alert('Error capturing audio.');
          }
        );
      } else {
        alert('getUserMedia not supported in this browser.');
      }
    };
    var lastClap = (new Date()).getTime();
    function detectClap(data){
      var t = (new Date()).getTime();
      if(t - lastClap < 200) return false; // TWEAK HERE
      var zeroCrossings = 0, highAmp = 0;
      for(var i = 1; i < data.length; i++){
        if(Math.abs(data[i]) > 0.25) highAmp++; // TWEAK HERE
        if(data[i] > 0 && data[i-1] < 0 || data[i] < 0 && data[i-1] > 0) zeroCrossings++;
      }
      if(highAmp > 20 && zeroCrossings > 30){ // TWEAK HERE
        //console.log(highAmp+' / '+zeroCrossings);
        lastClap = t;
        return true;
      }
      return false;
    }
    var rec = new Recording(function(data){
      if(detectClap(data)){
            $('.hide, .t, h1').toggle();
      }
    });

              
            
!
999px

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