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HTML

              
                <!-- 
  MADE FROM THE WONDERFUL CODE OF Chris Wilson
  https://webaudiodemos.appspot.com/volume-meter/
-->
<svg viewBox="0 0 101 33" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="1.5">
  <path id="path" d="M.5 14.761 c1.244 0 1.236 3.9 1.996 3.9.761 0 1.205-6.017 1.967-6.017.763 0 1.153 8.252 2.272 8.294 1.12.042 1.298-10.767 2.382-10.767 1.083 0 1.062 14.022 2.224 14.022 1.163 0 1.424-17.596 2.367-17.596.944 0 1.132 21.22 2.256 21.22 1.124 0 1.176-24.517 2.259-24.517 1.084 0 1.186 27.425 2.25 27.425 1.063 0 1.433-29.361 2.477-29.361 1.043 0 1.317 30.886 2.28 30.886.963 0 1.239-31.75 2.403-31.75s.996 30.953 2.159 30.953c1.162 0 1.077-29.34 2.401-29.34 1.324 0 .88 27.364 2.044 27.364 1.163 0 1.3-24.585 2.299-24.585.998 0 1.453 21.328 2.376 21.328.923 0 1.559-17.764 2.33-17.752.879.013.831 13.885 2.356 13.885s1.719-10.559 2.842-10.559c1.124 0 1.985 10.441 2.865 10.441.881 0 .579-10.471 1.903-10.471s.657 5.961 1.941 5.961 1.053-5.902 2.012-5.903c.98-.002.458 10.434 1.622 10.434 1.163 0 1.625-13.753 2.782-13.728 1.14.023 1.06 17.714 2.344 17.714 1.284 0 1.088-21.383 2.292-21.383 1.204 0 1.263 24.575 2.266 24.575 1.004 0 1.124-27.442 2.124-27.442.999 0 1.425 29.572 2.504 29.572 1.08 0 1.033-30.967 2.157-30.967 1.123 0 1.082 31.608 2.375 31.608 1.292 0 1.23-30.783 2.22-30.783.991 0 1.214 29.195 2.516 29.195 1.303 0 1.137-27.284 2.233-27.295 1.094-.012 1.045 24.406 2.289 24.406 1.244 0 1.146-21.129 2.229-21.129 1.084 0 .945 17.469 2.361 17.719 1.415.251 1.085-14.159 2.183-14.159 1.098 0 1.369 10.961 2.453 10.961 1.083 0 1.18-8.521 2.146-8.498.963.022 1.302 6.084 2.195 6.084.892 0 .228-4.225 2.048-4.225" fill="none" stroke="#fefefe" stroke-width="1px"/>
</svg>


              
            
!

CSS

              
                * {
  margin: 0;
  transition: all -1s;
}
svg {
  position: absolute;
  top: 50%;
  left: 0%;
  transform: translateY(-50%);
}
body {
  background: #0B0F10;
}

#id {
  height: 100px;
  background: blue;
}
              
            
!

JS

              
                var audioContext = null;
var meter = null;
var rafID = null;

window.onload = function() {
    // monkeypatch Web Audio
    window.AudioContext = window.AudioContext || window.webkitAudioContext;
	
    // grab an audio context
    audioContext = new AudioContext();

    // Attempt to get audio input
    try {
        // monkeypatch getUserMedia
        navigator.getUserMedia = 
        	navigator.getUserMedia ||
        	navigator.webkitGetUserMedia ||
        	navigator.mozGetUserMedia;

        // ask for an audio input
        navigator.getUserMedia(
        {
            "audio": {
                "mandatory": {
                    "googEchoCancellation": "false",
                    "googAutoGainControl": "false",
                    "googNoiseSuppression": "false",
                    "googHighpassFilter": "false"
                },
                "optional": []
            },
        }, gotStream, didntGetStream);
    } catch (e) {
        alert('getUserMedia threw exception :' + e);
    }

}

function didntGetStream() {
    alert('Stream generation failed.');
}

var mediaStreamSource = null;

function gotStream(stream) {
  audioContext.resume();
    // Create an AudioNode from the stream.
    mediaStreamSource = audioContext.createMediaStreamSource(stream);

    // Create a new volume meter and connect it.
    meter = createAudioMeter(audioContext, .7);
    mediaStreamSource.connect(meter);

    // kick off the visual updating
    drawSVG();
}

function drawSVG( time ) {
  var body = document.getElementsByTagName("body")[0];
  var path = document.getElementById("path");
  
  // set the stroke-width of the SVG in relation to the volume
  path.setAttribute("stroke-width", meter.volume*10 + "px"); 
  
  // if the audio is clipping change the background color
  if (meter.checkClipping()) {
    //use milliseconds to get a modulator
    var modulator = (360/999)*((new Date()).getMilliseconds());
    body.style.background = "hsl("+modulator+", 100%, 50%)";
  } else {
    body.style.background = "#0B0F10";
  }
  window.requestAnimationFrame( drawSVG );
}

// FIX FOR CHROME
// https://github.com/processing/p5.js-sound/issues/249#issuecomment-386657799
var restart = function () {
  if (audioContext.state !== 'running') {
    audioContext.resume();
  }
}
              
            
!
999px

Console