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HTML

              
                <div class="wrapper">
    <svg version="1.1" id="logo" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="100%" y="100%" viewBox="0 0 283.8 60.2" enable-background="new 0 0 283.8 60.2" xml:space="preserve">
        <g>
            <path fill="#200706" d="M0,56.5V3.3c0-1.7,1.4-3.1,3-3.1h4.6c1.5,0,2.7,1.2,2.7,2.8v44.9c0,1.7,1.3,3.1,3,3.1h20.5
                                    c1.3,0,2.4,1.1,2.4,2.5v3.9c0,1.6-1.3,2.9-2.9,2.9H3.6C1.6,60.2,0,58.6,0,56.5z"></path>
            <path fill="#200706" d="M61.8,57.3V2.6c0-1.3,1.1-2.4,2.4-2.4h5c1.7,0,3,1.4,3,3.1v54.4c0,1.4-1.1,2.6-2.5,2.6h-5
                                    C63,60.2,61.8,58.9,61.8,57.3z"></path>
            <path fill="#200706" d="M177.8,59V32.3c0-1.1,0.9-1.9,1.9-1.9h3.2c0.7,0,1.2,0.5,1.2,1.2v26.6c0,1.1-0.9,1.9-1.9,1.9H179
                                    C178.4,60.2,177.8,59.7,177.8,59z"></path>
            <path fill="#200706" d="M219.9,58.6l-11.1-15.2c-0.6-0.8-1.9-0.4-1.9,0.6v14.3c0,1.1-0.9,2-2,2h-1.6c-1.6,0-2.8-1.3-2.8-2.8V33.2
                                    c0-1.5,1.3-2.8,2.8-2.8h1.9c1.2,0,2.3,0.6,3,1.5l10.8,14.7c0.6,0.8,1.9,0.4,1.9-0.6V32.3c0-1.1,0.9-2,2-2h1.7
                                    c1.5,0,2.7,1.2,2.7,2.7v24.4c0,1.5-1.2,2.7-2.7,2.7h-1.4C221.8,60.2,220.6,59.6,219.9,58.6z"></path>
            <path fill="#200706" d="M256,60.2c-2.2,0-4.3-0.4-6.3-1.1c-1.9-0.7-3.6-1.7-5-3c-1.4-1.3-2.5-2.9-3.4-4.7c-0.8-1.8-1.2-3.8-1.2-6.1
                                    s0.4-4.2,1.2-6.1c0.8-1.8,1.9-3.4,3.4-4.7c1.4-1.3,3.1-2.3,5-3c1.9-0.7,4-1.1,6.3-1.1c1.6,0,3.1,0.2,4.4,0.6
                                    c1.3,0.4,2.5,0.9,3.5,1.6c1,0.6,1.9,1.4,2.6,2.2c0.2,0.2,0.3,0.4,0.5,0.6c0.8,1,0.5,2.5-0.7,3.1l-1.6,0.8c-0.9,0.4-1.9,0.2-2.5-0.5
                                    c-0.5-0.6-1.2-1.2-1.9-1.7c-1.3-0.8-2.7-1.2-4.2-1.2c-1.3,0-2.6,0.2-3.7,0.7c-1.2,0.5-2.1,1.1-3,2c-0.8,0.8-1.5,1.8-2,3
                                    c-0.5,1.2-0.7,2.4-0.7,3.8s0.2,2.6,0.7,3.8c0.5,1.2,1.1,2.2,2,3c0.8,0.8,1.8,1.5,3,2c1.2,0.5,2.4,0.7,3.7,0.7c1.6,0,3-0.4,4.2-1.2
                                    c0.8-0.5,1.4-1,2-1.7c0.6-0.7,1.7-0.9,2.5-0.5l1.6,0.8c1.2,0.6,1.6,2,0.7,3.1c-0.2,0.2-0.3,0.4-0.5,0.6c-0.7,0.8-1.6,1.6-2.6,2.3
                                    c-1,0.7-2.2,1.2-3.5,1.6C259.2,60,257.7,60.2,256,60.2z"></path>
            <path fill="#200706" d="M280.3,60.1c-1,0-1.8-0.3-2.5-1c-0.7-0.7-1-1.5-1-2.5s0.3-1.8,1-2.5c0.7-0.7,1.5-1,2.5-1c1,0,1.8,0.3,2.5,1
                                    c0.7,0.7,1,1.5,1,2.5s-0.3,1.8-1,2.5C282.1,59.8,281.2,60.1,280.3,60.1z"></path>
            <path fill="#200706" d="M148.2,30.4h-12.8c-2.3,0-4.8,2.1-4.9,4.3c0.1,2.3,2.7,3.7,5.1,3.7h5.6c1.5,0,2.8,1.5,2.8,3l0,2
                                    c0,0.9-0.3,1.8-1,2.4c-1.1,1.2-3.3,2.6-5.9,3.7c-2.5,1-5.6,1.7-8.6,1.7c-2.9,0-5.7-0.5-8.1-1.6c-2.5-1-4.6-2.5-6.4-4.4
                                    c-1.8-1.9-3.2-4.1-4.2-6.7c-1-2.6-1.5-5.4-1.5-8.4c0-3,0.5-5.8,1.5-8.4c1-2.6,2.4-4.8,4.2-6.7c1.8-1.9,3.9-3.3,6.4-4.4
                                    c2.5-1,5.2-1.6,8.1-1.6c3.4,0,6.4,0.7,9,2.2c0.1,0.1,0.2,0.1,0.3,0.2c1.4,0.8,2.6,1.7,3.7,2.8c1.5,1.4,3.7,1.7,5.5,0.7l0.8-0.4
                                    l0.7-0.4c2-1.1,2.5-3.8,0.9-5.5c-0.4-0.4-0.9-0.9-1.3-1.3c-1.6-1.5-3.3-2.8-5.3-3.8c-1.9-1.1-4.1-1.9-6.5-2.6c-2.4-0.6-5-1-7.9-1
                                    c-4.2,0-8.2,0.7-12,2.1c-3.8,1.4-7.1,3.4-9.9,6.1c-2.8,2.6-5,5.8-6.6,9.5c-1.6,3.7-2.4,7.8-2.4,12.4c0,4.5,0.8,8.7,2.4,12.4
                                    c1.6,3.7,3.8,6.9,6.6,9.5c2.8,2.6,6.1,4.7,9.9,6.1c3.8,1.4,7.8,2.1,12,2.1c5.2,0,9.7-1,13.7-2.9c1.9-0.9,3.5-1.9,5.2-3.1
                                    c3.3-2.4,5-6.2,5-10.2v-8.8C152.4,32.7,150.7,30.4,148.2,30.4z"></path>
        </g>
</svg>
</div>
              
            
!

CSS

              
                html, body {
    width: 100%;
    height: 100%;
}
body {
    margin: 0;
}
.wrapper {
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    padding: 40px;
    position: relative;
}
svg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
}
              
            
!

JS

              
                // あらかじめgetUserMediaのポリフィルが読み込まれています
// https://github.com/lig-dsktschy/ligfes20160426/blob/gh-pages/01/js/getusermedia-commented.js

'use strict';

var ctx, analyser, frequencies, getByteFrequencyDataAverage, elLogo, draw;

window.AudioContext = window.AudioContext || window.webkitAudioContext;
ctx = new AudioContext();

analyser = ctx.createAnalyser();
frequencies = new Uint8Array(analyser.frequencyBinCount);

getByteFrequencyDataAverage = function() {
    analyser.getByteFrequencyData(frequencies);
    return frequencies.reduce(function(previous, current) {
        return previous + current;
    }) / analyser.frequencyBinCount;
};

navigator.mediaDevices.getUserMedia({audio: true})
    .then(function(stream) {
        window.hackForMozzila = stream;
        ctx.createMediaStreamSource(stream)
          // AnalyserNodeに接続
          .connect(analyser);
    })
    .catch(function(err) {
        console.log(err.message);
    });

// 透明度を変更する要素
elLogo = document.getElementById('logo');
// 可能な限り高いフレームレートで音量を取得し、透明度に反映する
(draw = function() {
    // opacityの範囲である0〜1に変換
    elLogo.style.opacity = getByteFrequencyDataAverage() / 255;
    requestAnimationFrame(draw);
})();
              
            
!
999px

Console