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HTML

              
                <audio id="soundElement"></audio>
<br>
<label for="audioInput" id="audioInputLabel">Choose a sound file. </label>
<input type="file" id="audioInput"/>
<p id="loadInput" onclick="loadDefaultSoundFile();">Play &nbsp;  LAST TRAIL &nbsp;  by Stan Williams.</p>
  
  

              
            
!

CSS

              
                html, body {
  overflow: hidden;
}

canvas {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  border: none;
  margin: 0;
  z-index: -1;
}

#audioInputLabel:hover {
  cursor: pointer;
  color: #aaa;
}

#audioInputLabel {
  font-family: Tahoma, Geneva, sans-serif;
  font-size: 15px;
  color: #fff;
  padding-left: 20px;
  text-decoration: underline;
}

#audioInput {
	width: 0.1px;
	height: 0.1px;
	opacity: 0;
	overflow: hidden;
	position: absolute;
	z-index: -1;
}

#loadInput {
  font-family: Tahoma, Geneva, sans-serif;
  font-size: 15px;
  color: #fff;
  padding-left: 20px;
  text-decoration: underline;
}

#loadInput:hover {
  cursor: pointer;
  color: #aaa;
}



              
            
!

JS

              
                let presets = {
  "preset": "Do It",
  "remembered": {
    "DIY": {
      "0": {
        "smoothing": 0.8,
        "minDecibels": -100,
        "maxDecibels": -24.023333077627456,
        "numberOfBars": 256,
        "visualiserWidthRatio": 1,
        "barGapRatio": 1,
        "yOffsetRatio": 0,
        "barMaxHeightRatio": 0.7166855772025342,
        "barHue": 50,
        "barSat": 100,
        "barBrightness": 0,
        "barOpacity": 0.34516080916772385,
        "backHue": 50,
        "backSat": 100,
        "backBrightness": 100,
        "backOpacity": 0.1891139827381498,
        "textHue": 0,
        "textSat": 0,
        "textBrightness": 0,
        "textOpacity": 0.12223677141118951,
        "partHue": 0,
        "partSat": 0,
        "partBrightness": 0,
        "partOpacity": 0.935166610512731,
        "textIncluded": true,
        "text": "Make your own! 😃",
        "textXOffsetRatio": 0.11697700706805958,
        "textYOffsetRatio": 0.6670320495022679,
        "textSize": 128.06081538085886,
        "numParticles": 207.7370962505678,
        "baseSpeed": 2.5045767977087308,
        "bassBoost": 5.516615283155818,
        "angleDirection": 5.579915202085805,
        "angleVarience": 0.15018001192291322,
        "particleSize": 1.2944557043534721,
        "particleVarience": 4.9248189844192485
      }
    },
    "Do It": {
      "0": {
        "smoothing": 0.8,
        "minDecibels": -100,
        "maxDecibels": -25,
        "numberOfBars": 64,
        "visualiserWidthRatio": 0.85,
        "barGapRatio": 0.75,
        "yOffsetRatio": 0.5,
        "barMaxHeightRatio": 0.4,
        "barHue": 320,
        "barSat": 100,
        "barBrightness": 100,
        "barOpacity": 1,
        "backHue": 0,
        "backSat": 0,
        "backBrightness": 6,
        "backOpacity": 1,
        "textHue": 0,
        "textSat": 0,
        "textBrightness": 100,
        "textOpacity": 1,
        "partHue": 0,
        "partSat": 0,
        "partBrightness": 100,
        "partOpacity": 1,
        "textIncluded": true,
        "text": "Music Visualiser",
        "textXOffsetRatio": 0.0678,
        "textYOffsetRatio": 0.3,
        "textSize": 136,
        "numParticles": 250,
        "baseSpeed": 1,
        "bassBoost": 3.5,
        "angleDirection": 0,
        "angleVarience": 0.25,
        "particleSize": 2,
        "particleVarience": 4
      }
    },
    "Toothless Hawkins": {
      "0": {
        "smoothing": 0.701502814566924,
        "minDecibels": -100,
        "maxDecibels": 0,
        "numberOfBars": 200,
        "visualiserWidthRatio": 0.85,
        "barGapRatio": 0.270992418949638,
        "yOffsetRatio": 0.5,
        "barMaxHeightRatio": 0.3590012257391113,
        "barHue": 135,
        "barSat": 100,
        "barBrightness": 100,
        "barOpacity": 1,
        "backHue": 0,
        "backSat": 0,
        "backBrightness": 2,
        "backOpacity": 1,
        "textHue": 0,
        "textSat": 0,
        "textBrightness": 100,
        "textOpacity": 1,
        "partHue": 0,
        "partSat": 0,
        "partBrightness": 100,
        "partOpacity": 1,
        "textIncluded": true,
        "text": "TOOTHLESS HAWKINS",
        "textXOffsetRatio": 0.07,
        "textYOffsetRatio": 0.33699902404174287,
        "textSize": 119,
        "numParticles": 0,
        "baseSpeed": 1,
        "bassBoost": 1,
        "angleDirection": 0,
        "angleVarience": 0.5,
        "particleSize": 2,
        "particleVarience": 4
      }
    },
    "Renegade": {
      "0": {
        "smoothing": 0.8,
        "minDecibels": -100,
        "maxDecibels": -29.849718543307603,
        "numberOfBars": 66.93344783860665,
        "visualiserWidthRatio": -1,
        "barGapRatio": 0.9,
        "yOffsetRatio": 0.8775204281458707,
        "barMaxHeightRatio": -0.8,
        "barHue": 100,
        "barSat": 100,
        "barBrightness": 100,
        "barOpacity": 1,
        "backHue": 0,
        "backSat": 0,
        "backBrightness": 6,
        "backOpacity": 0.3287930534041678,
        "textHue": 100,
        "textSat": 0,
        "textBrightness": 6.008620205119812,
        "textOpacity": 1,
        "partHue": 100,
        "partSat": 80,
        "partBrightness": 100,
        "partOpacity": 1.523792862918443,
        "textIncluded": true,
        "text": "RENEGADE - NOISESTORM",
        "textXOffsetRatio": 0.0125,
        "textYOffsetRatio": 0.725,
        "textSize": 113,
        "numParticles": 160,
        "baseSpeed": 2.0645327637613637,
        "bassBoost": 5.034829992906089,
        "angleDirection": 4.819959155458702,
        "angleVarience": 0.2682852645075171,
        "particleSize": 10,
        "particleVarience": 4
      }
    },
    "Too Simple": {
      "0": {
        "smoothing": 0.8,
        "minDecibels": -100,
        "maxDecibels": -25.44927820383394,
        "numberOfBars": 64,
        "visualiserWidthRatio": 0.85,
        "barGapRatio": 0.8,
        "yOffsetRatio": 0.2,
        "barMaxHeightRatio": 0.6,
        "barHue": 300,
        "barSat": 100,
        "barBrightness": 100,
        "barOpacity": 1,
        "backHue": 299.74262388875496,
        "backSat": 100,
        "backBrightness": 50,
        "backOpacity": 0.38477364743603654,
        "textHue": 300,
        "textSat": 100,
        "textBrightness": 50,
        "textOpacity": 1,
        "partHue": 300,
        "partSat": 70,
        "partBrightness": 100,
        "partOpacity": 2.6322086247494427,
        "textIncluded": true,
        "text": "Too Simple",
        "textXOffsetRatio": 0.08,
        "textYOffsetRatio": 0.21,
        "textSize": 108,
        "numParticles": 207.7370962505678,
        "baseSpeed": 1,
        "bassBoost": 5,
        "angleDirection": 6.28,
        "angleVarience": 0.16465489451291224,
        "particleSize": 1.4044667128403137,
        "particleVarience": 6.134940077774507
      }
    }
  },
  "closed": false,
  "folders": {
    "Processing": {
      "preset": "Default",
      "closed": true,
      "folders": {}
    },
    "Bars": {
      "preset": "Default",
      "closed": true,
      "folders": {}
    },
    "Colours": {
      "preset": "Default",
      "closed": true,
      "folders": {
        "Bar Colour": {
          "preset": "Default",
          "closed": true,
          "folders": {}
        },
        "Background Colour": {
          "preset": "Default",
          "closed": true,
          "folders": {}
        },
        "Text Colour": {
          "preset": "Default",
          "closed": true,
          "folders": {}
        },
        "Particle Colour": {
          "preset": "Default",
          "closed": true,
          "folders": {}
        }
      }
    },
    "Text": {
      "preset": "Default",
      "closed": true,
      "folders": {}
    },
    "Particles": {
      "preset": "Default",
      "closed": true,
      "folders": {}
    }
  }
}

let visualiser = {
  numberOfBars: 64,
  smoothing: 0.8,
  minDecibels: -100,
  maxDecibels: 0,
  
  visualiserWidthRatio: 0.85,
  barGapRatio: 0.75,
  yOffsetRatio: 0.5,
  barMaxHeightRatio: 0.4,
  
  barHue: 320,
  barSat: 100,
  barBrightness: 100,
  barOpacity: 1,
  backHue: 0,
  backSat: 0,
  backBrightness: 6,
  backOpacity: 1,
  textHue: 0,
  textSat: 0,
  textBrightness: 100,
  textOpacity: 1,
  partHue: 0,
  partSat: 0,
  partBrightness: 100,
  partOpacity: 1,
  
  textIncluded: true,
  text: "DO IT - ROOTKIT",
  textXOffsetRatio: 0.0678,
  textYOffsetRatio: 0.3,
  textSize: 163,
  
  numParticles: 250,
  baseSpeed: 1,
  bassBoost: 1,
  angleDirection: 0,
  angleVarience: 0.5,
  particleSize: 2,
  particleVarience: 4,
}

let gui = new dat.GUI({
  load: presets,
  preset: 'Do It'
});
gui.remember(visualiser);

let f1 = gui.addFolder('Processing');
let f2 = gui.addFolder('Bars');
let f3 = gui.addFolder('Colours');
let f4 = gui.addFolder('Text');
let f5 = gui.addFolder('Particles');

let smoothingController = f1.add(visualiser,'smoothing',0,1).name("Smoothing");
let minDecibelsController = f1.add(visualiser,'minDecibels',-100,0).name("minDecibels");
let maxDecibelsController = f1.add(visualiser,'maxDecibels',-100,0).name("maxDecibels");

let numberOfBarsController = f2.add(visualiser,'numberOfBars',0,256).name("Number of Bars");
f2.add(visualiser,'visualiserWidthRatio',-1,1).name("Visualiser Width");
f2.add(visualiser,'barGapRatio',-1,1).name("Gap Width");
f2.add(visualiser,'yOffsetRatio',0,1).name("Y Axis Position");
f2.add(visualiser,'barMaxHeightRatio',-1,1).name("Height of Bars");

let f31 = f3.addFolder('Bar Colour');
f31.add(visualiser, 'barHue',0,360).name("Hue");
f31.add(visualiser, 'barSat', 0, 100).name("Saturation");
f31.add(visualiser, 'barBrightness', 0, 100).name("Brightness");
f31.add(visualiser, 'barOpacity', 0, 1).name("Opacity");

let f32 = f3.addFolder('Background Colour');
f32.add(visualiser, 'backHue',0,360).name("Hue");
f32.add(visualiser, 'backSat', 0, 100).name("Saturation");
f32.add(visualiser, 'backBrightness', 0, 100).name("Brightness");
f32.add(visualiser, 'backOpacity', 0, 1).name("Opacity");

let f33 = f3.addFolder('Text Colour');
f33.add(visualiser, 'textHue', 0, 360).name("Hue");
f33.add(visualiser, 'textSat', 0, 100).name("Saturation");
f33.add(visualiser, 'textBrightness', 0, 100).name("Brightness");
f33.add(visualiser, 'textOpacity', 0, 1).name("Opacity");

let f34 = f3.addFolder('Particle Colour');
f34.add(visualiser, 'partHue', 0, 360).name("Hue");
f34.add(visualiser, 'partSat', 0, 100).name("Saturation");
f34.add(visualiser, 'partBrightness', 0, 100).name("Brightness");
f34.add(visualiser, 'partOpacity', 0, 3).name("Opacity");

f4.add(visualiser,'textIncluded').name("Include Text");
f4.add(visualiser,'text').name("Text");
f4.add(visualiser, 'textXOffsetRatio', -1, 1).name("X Axis Position");
f4.add(visualiser, 'textYOffsetRatio', -1, 1).name("Y Axis Position");
f4.add(visualiser, 'textSize', 1, 600).name("Text Size");

let numOfParticlesController = f5.add(visualiser,'numParticles',0,500).name("Number");
f5.add(visualiser,'baseSpeed',0,10).name("Base Speed");
f5.add(visualiser,'bassBoost',0,10).name("Treble Boost");
let angleDirectionController = f5.add(visualiser,'angleDirection',0,6.28).name("Direction");
let angleVarienceController = f5.add(visualiser,'angleVarience',0,3.14).name("Varience");
let particleSizeController = f5.add(visualiser,'particleSize',0,10).name("Size");
let particleSizeVarienceController = f5.add(visualiser,'particleVarience',0,10).name("Varience");

gui.close();


let mV = new MusicVisualiser(visualiser.numberOfBars,"soundElement");

//Declaring the controllers which trigger reset of the visualisers arrays.
numberOfBarsController.onChange(function(val) {
  mV.setNumberOfBars(val);
});
smoothingController.onChange(function(val) {
  mV.setSmoothingTimeConstant(val);
});
minDecibelsController.onChange(function(val) {
  mV.analyser.minDecibels = val;
});
maxDecibelsController.onChange(function(val) {
  mV.analyser.maxDecibels = val;
});

numOfParticlesController.onChange(function(val) {
  particles = []
  for (let i = 0; i < visualiser.numParticles; i++){
    particles.push(new Particle());
  }
});

angleDirectionController.onChange(function(val) {
  for (let i = 0; i < visualiser.numParticles; i++){
    particles[i].updateDirection();
  }
});

angleVarienceController.onChange(function(val) {
  for (let i = 0; i < visualiser.numParticles; i++){
    particles[i].updateDirection();
  }
});

particleSizeController.onChange(function(val) {
  for (let i = 0; i < visualiser.numParticles; i++){
    particles[i].updateSize();
  }
});

particleSizeVarienceController.onChange(function(val) {
  for (let i = 0; i < visualiser.numParticles; i++){
    particles[i].updateSize();
  }
});

//Playing user selected audio files.
mV.setAudioFileInputElementID("audioInput");
audioInput.onchange = function() { 
  mV.loadUserSelectedSoundFile();
};

//Playing the default sound file.
function loadDefaultSoundFile() {
  mV.setAudioFileURL("https://archive.org/download/StanWilliamsLastTrail/StanWilliamsLastTrail.mp3");
  mV.loadDefaultSoundFile();
}

/* --- Particles --- */

function Particle() {
  //Pick co-ordinates limited to a box within the window (makes it look neater)
  this.y = random(windowHeight);
  this.x = random(windowWidth);
  
  this.size = visualiser.particleSize + random(visualiser.particleVarience);
  this.force = visualiser.baseSpeed;
  this.angle = map(random(1),0,1, visualiser.angleDirection - visualiser.angleVarience, visualiser.angleDirection + visualiser.angleVarience);
  this.opacity = 0.34 + random(0.66);
  
  this.updateDirection = function(){
    this.angle = map(random(1),0,1, visualiser.angleDirection - visualiser.angleVarience, visualiser.angleDirection + visualiser.angleVarience);
  }
  
  this.updateSize = function() {
    this.size = visualiser.particleSize + random(visualiser.particleVarience);
  }
  
  this.move = function() {
    
    this.force = visualiser.baseSpeed + mV.getTreble()*visualiser.bassBoost;
    
    this.x += this.force * cos(this.angle);
    this.y += this.force * sin(this.angle);
    
    if (this.x > windowWidth + 10){ 
      this.x -= (windowWidth+20);
    }
    if (this.x < -10){ 
      this.x += windowWidth+20;
    }
    if (this.y > windowHeight + 10){ 
      this.y -= (windowHeight+20);
    }
    if (this.y < -10){ 
      this.y += windowHeight + 20;
    }
  }
  
  this.display = function(){
    fill(visualiser.partHue,visualiser.partSat,visualiser.partBrightness,visualiser.partOpacity * this.opacity);
    ellipse(this.x, this.y, this.size);
  }
}

/* --- ANIMATION --- */

let particles = [];

function setup(){
  createCanvas(windowWidth, windowHeight);
  rectMode(CORNERS);
  colorMode(HSB, 360, 100, 100, 1);
  //fill(visualiser.barColour[0], visualiser.barColour[1], visualiser.barColour[2],visualiser.barColour[3]);
  for (let i = 0; i < visualiser.numParticles; i++){
    particles.push(new Particle());
  }
}

let beatFadeFactor = 0;

function draw(){
  mV.updateFrequencyData();
  
  drawBackground();
  drawBars();
  if (visualiser.textIncluded){
    drawText();    
  }
}

function drawBackground(){

  background(visualiser.backHue,visualiser.backSat,visualiser.backBrightness,visualiser.backOpacity);
    
  fill(visualiser.partHue,visualiser.partSat,visualiser.partBrightness,visualiser.partOpacity);
  
  for (let i = 0; i < visualiser.numParticles; i++){
    particles[i].move();
    particles[i].display();
  }
  /*
  if (mV.beat){
    beatFadeFactor = 100;
  } else {
    if (beatFadeFactor > 0)
      beatFadeFactor -= 2;
  }
  */
}

function drawBars(){
  noStroke();
  fill(visualiser.barHue,visualiser.barSat,visualiser.barBrightness,visualiser.barOpacity);
  
  let visualiserWidth = windowWidth * visualiser.visualiserWidthRatio;
  let barPlusGapWidth = visualiserWidth / mV.numberOfBars;
  let barWidth = barPlusGapWidth * visualiser.barGapRatio;
  
  let xStartingPoint = (windowWidth/2) - (visualiserWidth/2);
  let additiveXOffset = xStartingPoint;
  
  let barMaxHeight = windowHeight * visualiser.barMaxHeightRatio;
  let yOffset = windowHeight * (1-visualiser.yOffsetRatio) - barMaxHeight;
  
  for (let i = 0; i < mV.numberOfBars; i++){
    rect(
      additiveXOffset,                                              //bottom left corner x coordinate.
      yOffset + barMaxHeight,                                       //bottom left corner y coordinate.
      additiveXOffset + barWidth,                                   //top right corner x coordinate.
      yOffset + barMaxHeight - mV.barHeights[i] * barMaxHeight      //top right corner y coordinate.
    );    
    additiveXOffset += barPlusGapWidth;
  }
  
}

function drawText(){
  let textX = windowWidth * visualiser.textXOffsetRatio;
  let textY = windowHeight * (1-visualiser.textYOffsetRatio)
  textFont('Helvetica');
  textSize(visualiser.textSize);
  fill(visualiser.textHue, visualiser.textSat, visualiser.textBrightness, visualiser.textOpacity);
  textStyle(BOLD);
  text(visualiser.text, textX, textY);
}
              
            
!
999px

Console