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audio visualizer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Web Audio Visualizer</title>
<style>
@import url('https://fonts.googleapis.com/css?family=Metal+Mania');
body
{
background: #000000;
font-family: tahoma, verdana, "sans serif";
color: #FFFFFF;
text-align: center;
}
h1,h2
{
font-family: "Metal Mania", cursive;
}
canvas
{
margin-top: 10px;
margin-left: 10px;
background: black;
}
#controls
{
margin-left: 10px;
margin-top: 10px;
}
#canvas2
{
border: 2px ridge #FFFFFF;
background: #111;
}
</style>
<script>
// An IIFE ("Iffy") - see the notes in mycourses
(function(){
"use strict";
// Audio Variables
var NUM_SAMPLES = 256;
var SOUND_1 = 'media/☆ＳＥＩＮＷＡＶＥ☆２０００☆.mp3';
var SOUND_2 = 'media/The Doomsday.mp3';
var SOUND_3 = 'media/Artificial Intelligence Bomb.mp3';
var audioElement = undefined;
var analyserNode = undefined;
var delayNode = undefined;
var lowShelfNode = undefined;
// Canvases
var canvas,ctx = undefined;
var canvas2,ctx2 = undefined;
var bassFocused = true; // Are we currently viewing the bass, or the amp?
// Effects pseudo enums
var EFFECT_BOOLS = Object.freeze({
TINT_RED: 0,
INVERT: 1,
NOISE: 2,
LINES: 3,
DISTORTION: 4,
ACCURATE_STRUM: 5,
DIVIDE_WAVEFORM: 6,
USE_GRADIENT: 7
});
var EFFECT_SLIDERS = Object.freeze({
DISTORTION_HORIZONTAL: 0,
DISTORTION_VERTICAL: 1,
BASS_BOOST: 2,
DELAY: 3,
MAX_RADIUS: 4
});
var effectBools = [];
var effectSliders = [];
// Bass Amp Visual Effect
var ampEffect = 0;
// Pseudo Enum for Bass Amp Effects
var AMP_EFFECTS = Object.freeze({
RECTANGLES: 0,
CIRCLES: 1,
BEZIER: 2
});
// Images
var bassImg = undefined;
var ampImg = undefined;
// Initialize all components to the visualizers
function init(){
// Set up the canvases and their contexts
canvas = document.querySelector('#canvas');
ctx = canvas.getContext("2d");
canvas2 = document.querySelector("#canvas2");
ctx2 = canvas2.getContext("2d");
// Get reference to <audio> element on page
audioElement = document.querySelector('audio');
// Set up the node hierarchy and get our analyser node
analyserNode = createWebAudioContextWithAnalyserNode(audioElement);
// Get all of the UI elements working
setupUI();
// Load and play default sound into audio element
playStream(audioElement,SOUND_1);
// Get the images
bassImg = document.getElementById("bassImg");
ampImg = document.getElementById("ampImg");
// Start animation loop
update();
};
// Connect all desired audio nodes together in the desired pattern, then return the resulting Analyser Node
function createWebAudioContextWithAnalyserNode(audioElement) {
var audioCtx, analyserNode, sourceNode;
// Create new AudioContext
// The || is because WebAudio has not been standardized across browsers yet
// http://webaudio.github.io/web-audio-api/#the-audiocontext-interface
audioCtx = new (window.AudioContext || window.webkitAudioContext);
// Create an analyser node
analyserNode = audioCtx.createAnalyser();
// Create BiQuadFilterNode instance (bass boost)
lowShelfNode = audioCtx.createBiquadFilter();
lowShelfNode.type = "lowshelf";
lowShelfNode.frequency.value = 150;
// create DelayNode instance
delayNode = audioCtx.createDelay();
delayNode.delayTime.value = 0.0;
/*
We will request NUM_SAMPLES number of samples or "bins" spaced equally
across the sound spectrum.
If NUM_SAMPLES (fftSize) is 256, then the first bin is 0 Hz, the second is 172 Hz,
the third is 344Hz. Each bin contains a number between 0-255 representing
the amplitude of that frequency.
*/
// fft stands for "Fast Fourier Transform"
analyserNode.fftSize = NUM_SAMPLES;
// Hook up the source node to the <audio> element
sourceNode = audioCtx.createMediaElementSource(audioElement);
// This channel will only have the source and the bass boost connected to the destination
sourceNode.connect(lowShelfNode);
lowShelfNode.connect(audioCtx.destination);
// This channel will have the source, bass boost, and the delay. It will also be the one visualized.
sourceNode.connect(lowShelfNode);
lowShelfNode.connect(delayNode);
delayNode.connect(analyserNode);
analyserNode.connect(audioCtx.destination);
return analyserNode;
}
// Set up the UI elements.
function setupUI(){
var myUI = document.querySelectorAll("input");
// Hurrah for compact, non-repetitive code!
// Get all of the <input> elements, parse them by type, and assign onchange handlers
var currentSlider = 0;
for(var i = 0; i < myUI.length; i++){
if(myUI[i].type == "checkbox"){
effectBools.push(false);
myUI[i].index = i - currentSlider;
myUI[i].onchange = function(e){
effectBools[e.target.index] = e.target.checked;
};
}
else if(myUI[i].type == "range"){
effectSliders.push(0.0);
myUI[i].index = currentSlider;
myUI[i].onchange = function(e){
effectSliders[e.target.index] = parseFloat(e.target.value);
};
currentSlider++;
}
}
effectSliders[EFFECT_SLIDERS.MAX_RADIUS] = 40;
// The selected track has been changed
document.querySelector("#trackSelect").onchange = function(e){
playStream(audioElement,e.target.value);
};
// The full screen button has been clicked
document.querySelector("#fsButton").onclick = function(){
requestFullscreen(canvas);
};
// The view toggle button has been clicked
document.querySelector("#canvas2").onclick = function(e){
bassFocused = !bassFocused;
// If we're now looking at the bass, make the relevant changes to the UI and HTML.
if(bassFocused){
document.querySelector("h1").innerHTML = "Bass Guitar Visualizer";
document.querySelector("#bassEffectsDiv").style.display = "initial";
document.querySelector("#ampEffectsDiv").style.display = "none";
}
// Do the same if we're now looking at the amp.
else{
document.querySelector("h1").innerHTML = "Bass Amp Visualizer";
document.querySelector("#ampEffectsDiv").style.display = "initial";
document.querySelector("#bassEffectsDiv").style.display = "none";
}
};
// The Bass Amp effect has been changed
document.querySelector("#ampEffectSelect").onchange = function(e){
// Change the variable depending on the newly selected effect, and make changes to the UI accordingly.
switch(e.target.value){
case "rectangles":{
ampEffect = AMP_EFFECTS.RECTANGLES;
document.querySelector("#radiusLabel").style.display = "none";
document.querySelector("#gradientLabel").style.display = "initial";
break;
}
case "circles":{
ampEffect = AMP_EFFECTS.CIRCLES;
document.querySelector("#radiusLabel").style.display = "inline";
document.querySelector("#gradientLabel").style.display = "none";
break;
}
case "bezier":{
ampEffect = AMP_EFFECTS.BEZIER;
document.querySelector("#radiusLabel").style.display = "none";
document.querySelector("#gradientLabel").style.display = "initial";
break;
}
}
};
};
// Play the audio file located at [path] using [audioElement], and update the HTML accordingly.
function playStream(audioElement,path){
audioElement.src = path;
audioElement.play();
audioElement.volume = 0.2;
document.querySelector('#status').innerHTML = "Now playing: " + path;
};
// Get the data from the audio nodes and the UI, and update the canvas and audio nodes accordingly.
function update() {
// Keep the update loop going!
requestAnimationFrame(update);
/*
Nyquist Theorem
http://whatis.techtarget.com/definition/Nyquist-Theorem
The array of data we get back is 1/2 the size of the sample rate
*/
// Create an array of 8-bit unsigned ints
var data = new Uint8Array(NUM_SAMPLES/2);
// Populate the array with the appropriate type of data depending on the current view
if(bassFocused){
analyserNode.getByteTimeDomainData(data);
}
else{
analyserNode.getByteFrequencyData(data);
}
// BEGIN DRAWING //
// Clear both canvases
ctx.clearRect(0,0,640,400);
ctx2.clearRect(0, 0, 128, 80);
// Draw the appropriate background images to each canvas based on current view
if(bassFocused){
ctx.drawImage(bassImg, 0, 94);
ctx2.drawImage(ampImg, 26, 0, 75, 80);
}
else{
ctx.drawImage(ampImg, 132, 0);
ctx2.drawImage(bassImg, 0, 19, 128, 40);
}
// Draw the visualizations based on the data from the array
for(var i = 0; i < data.length; i++) {
// Draw the bass strings (waveform) visualizer
if(bassFocused){
var nodeSpacing = 3.6;
var extraSpace = 2;
var topSpacing = 50;
var adjustedLength = data.length;
var accessor = i;
ctx.strokeStyle = "red";
ctx.lineWidth = 2;
// If we have the waveform divided across the strings, we need only a fourth of the samples per string
// That means more space between samples
if(effectBools[EFFECT_BOOLS.DIVIDE_WAVEFORM]){
nodeSpacing *= 4;
extraSpace *= 4;
adjustedLength /= 4;
// If i is >= adjustedLength, then we've already drawn everything we need to.
if(i >= adjustedLength){
break;
}
}
// Draw a cool line
for(var j = 0; j < 4; j++){
if(effectBools[EFFECT_BOOLS.DIVIDE_WAVEFORM]){
// Have to be able to access the data at different places if we're dividing the waveform
accessor = i + (j * adjustedLength);
}
// Decrease the thickness of the strings as we go down the bass
ctx.lineWidth = 2 - (j / 2);
var node1Height;
var node2Height;
// Default height
node1Height = node2Height = topSpacing + 256;
// If accurate strum is off, we want the raw amplitude, regardless of location
if(!effectBools[EFFECT_BOOLS.ACCURATE_STRUM]){
node1Height -= data[accessor];
node2Height -= data[accessor + 1];
}
// If accurate strum is on, decrease the amplitude towards the ends of the bass
else{
node1Height -= (((data[accessor] - 128) * Math.sin((i / adjustedLength) * Math.PI)) + 128);
node2Height -= (((data[accessor + 1] - 128) * Math.sin(((i + 1) / adjustedLength) * Math.PI)) + 128);
}
// Spread the strings by 10 pixels at the bridge
node1Height += (10 * j);
node2Height += (10 * j);
// Slant the lower strings upwards so that they reach the top neck at the right height
node1Height -= (j * ((5 * i) / adjustedLength));
node2Height -= (j * ((5 * (i + 1)) / adjustedLength));
// We're at the bridge
if(i == 0){
ctx.beginPath();
ctx.moveTo(56, 128 + topSpacing + (10 * j));
ctx.lineTo(Math.ceil(i * (nodeSpacing)) + 56 + extraSpace, node1Height);
ctx.stroke();
ctx.closePath();
}
ctx.beginPath();
ctx.moveTo(Math.ceil(i * (nodeSpacing)) + 56 + extraSpace, node1Height);
// We're somewhere between the bridge and the top of the neck
if(i < adjustedLength - 1){
ctx.lineTo(Math.ceil((i + 1) * (nodeSpacing)) + 56 + extraSpace, node2Height);
}
// We're at the top of the neck
else{
ctx.lineTo(517, 128 + topSpacing + (10 * j) - (j * ((5 * (i + 1)) / adjustedLength)));
}
ctx.stroke();
ctx.closePath();
}
}
// Draw the amp (frequency) visualizer
// i < 82 so that we don't draw those annoying high frequencies that rarely move from 0
// (also so that we don't draw the rectangles / bezier curves past the edge of the amp screen)
else if(i < 82){
if(ampEffect == AMP_EFFECTS.RECTANGLES){
var barSpacing = 1;
var barWidth = 2;
var barHeight = 32;
var topSpacing = 80;
if(!effectBools[EFFECT_BOOLS.USE_GRADIENT]){
ctx.fillStyle = "red";
}
else{
var myGrad = ctx.createLinearGradient(0, topSpacing + 256, 0, 154);
myGrad.addColorStop(0, "#0000FF");
myGrad.addColorStop(0.5, "#00FF00");
myGrad.addColorStop(1, "#FF0000");
ctx.fillStyle = myGrad;
}
// Draw the rectangles based on our specified parameters
// We scale it down vertically a bit so we don't go off the top of the amp screen
ctx.fillRect((i * (barWidth + barSpacing)) + 197, topSpacing + 256 - (data[i] * 0.7), barWidth, barHeight);
}
else if(ampEffect == AMP_EFFECTS.CIRCLES){
// Reddish circles
var percent = data[i] / 255;
var circleRadius = percent * effectSliders[EFFECT_SLIDERS.MAX_RADIUS];
ctx.beginPath();
ctx.fillStyle = makeColor(255, 128, 0, 0.34 - percent/3.0);
ctx.arc(canvas.width/2, 267, circleRadius, 0, 2 * Math.PI, false);
ctx.fill();
ctx.closePath();
// Blue-ish circles, bigger, more transparent
ctx.beginPath();
ctx.fillStyle = makeColor(255, 0, 0, 0.10 - percent/10.0);
ctx.arc(canvas.width/2, 267, circleRadius * 1.5, 0, 2 * Math.PI, false);
ctx.fill();
ctx.closePath();
// Yellowish circles, smaller
ctx.save();
ctx.beginPath();
ctx.fillStyle = makeColor(255, 255, 0, 0.5 - percent/5.0);
ctx.arc(canvas.width/2, 267, circleRadius * 0.50, 0, 2 * Math.PI, false);
ctx.fill();
ctx.closePath();
ctx.restore();
}
else if(ampEffect == AMP_EFFECTS.BEZIER){
var nodeSpacing = 3;
var topSpacing = 80;
if(!effectBools[EFFECT_BOOLS.USE_GRADIENT]){
ctx.strokeStyle = "red";
}
else{
var myGrad = ctx.createLinearGradient(0, topSpacing + 256, 0, 154);
myGrad.addColorStop(0, "#0000FF");
myGrad.addColorStop(0.5, "#00FF00");
myGrad.addColorStop(1, "#FF0000");
ctx.strokeStyle = myGrad;
}
ctx.lineWidth = 2;
// Draw some bezier curves!
// Much like the rectangles, we scale down vertically so we don't go off the top
ctx.beginPath();
ctx.moveTo((i * nodeSpacing) + 197, topSpacing + 256 - (data[i] * 0.7));
ctx.quadraticCurveTo(((i + 1) * nodeSpacing) + 197, topSpacing + 256 - (data[i + 1] * 0.7), ((i + 2) * nodeSpacing) + 197, topSpacing + 256 - (data[i + 2] * 0.7));
ctx.stroke();
// Since the bezier curves nab more than one data value at a time, we can skip a loop iteration!
i++;
}
}
}
manipulatePixels();
// END DRAWING //
// Apply audio effects
lowShelfNode.gain.value = effectSliders[EFFECT_SLIDERS.BASS_BOOST];
delayNode.delayTime.value = effectSliders[EFFECT_SLIDERS.DELAY];
};
// Apply any per-pixel effects
function manipulatePixels(){
// i) Get all of the rgba pixel data of the canvas by grabbing the
// ImageData Object
// https://developer.mozilla.org/en-US/docs/Web/API/ImageData
var imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
// ii) imageData.data is an 8-bit typed array - values range from 0-255
// imageData.data contains 4 values per pixel: 4 x canvas.width x
// canvas.height = 1024000 values!
// We're looping through this 60 FPS - wow!
var data = imageData.data;
var length = data.length;
var width = imageData.width;
var height = imageData.height;
// iii) Iterate through each pixel
// we step by 4 so that we can manipulate 1 pixel per iteration
// data[i] = red
// data[i + 1] = green
// data[i + 2] = blue
// data[i + 3] = alpha channel
for(var i = 0; i < length; i += 4){
// BONUS: Cool raster distortion effect; Seeing Double!
// I gave this vertical distortion effect my best college try, but it just didn't want to work
// I even tried refactoring the whole effect to never work ahead, but I couldn't get it to function as smoothly
if(effectBools[EFFECT_BOOLS.DISTORTION]){
// Vertical Distortion
if(effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] > 0){
var row = Math.floor(i/4/width);
var column = (i % (width * 4)) / 4;
// We want to offset adjacent columns in opposite directions to achieve the effect
if((column % 2) == 0){
// If we're trying to sample pixels that are "off-screen", just overwrite with black
if(height - row <= effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] / 4){
data[i] =
data[i + 1] =
data[i + 2] =
data[i + 3] = 0;
}
// Shifting the image up; grab the pixel that's [effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL]] pixels down.
else{
data[i] =
data[((i + (effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] * width)) % length)];
data[i + 1] =
data[((i + (effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] * width)) % length) + 1];
data[i + 2] =
data[((i + (effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] * width)) % length) + 2];
data[i + 3] =
data[((i + (effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] * width)) % length) + 3];
}
}
else{
// Overwriting "off-screen" pixels
if(height - row <= effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL] / 4){
data[((length - 4) - i) + 4] =
data[((length - 4) - i) + 5] =
data[((length - 4) - i) + 6] =
data[((length - 4) - i) + 7] = 0;
}
// Shifting the image down; Moving from the bottom-right of the image
// Grab the pixel that's [effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL]] pixels up.
else{
data[((length - 4) - i) + 4] =
data[((length - 4) - i) - (width * effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL]) + 4];
data[((length - 4) - i) + 5] =
data[((length - 4) - i) - (width * effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL]) + 5];
data[((length - 4) - i) + 6] =
data[((length - 4) - i) - (width * effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL]) + 6];
data[((length - 4) - i) + 7] =
data[((length - 4) - i) - (width * effectSliders[EFFECT_SLIDERS.DISTORTION_VERTICAL]) + 7];
}
}
}
// Horizontal Distortion
if(effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] > 0){
var row = Math.floor(i/4/width);
// We want to offset adjacent rows in opposite directions to achieve the effect
if((row % 2) == 0){
// If we're trying to sample pixels that are "off-screen", just overwrite with black
if(width - ((i / 4) % width) <= (effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] / 4)){
data[i] =
data[i + 1] =
data[i + 2] =
data[i + 3] = 0;
}
// Shifting the image left; grab the pixel that's [effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL]] pixels to the right.
else{
data[i] = data[i + effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL]];
data[i + 1] = data[i + effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] + 1];
data[i + 2] = data[i + effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] + 2];
data[i + 3] = data[i + effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] + 3];
}
}
else{
// Overwriting "off-screen" pixels
if(width - ((i / 4) % width) <= (effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] / 4)){
data[((length - 4) - i + (width * 4))] =
data[((length - 4) - i + (width * 4)) + 1] =
data[((length - 4) - i + (width * 4)) + 2] =
data[((length - 4) - i + (width * 4)) + 3] = 0;
}
// Shifting the image right; Moving from the bottom-right of the image
// Grab the pixel that's [effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL]] pixels to the left.
else{
data[((length - 4) - i + (width * 4))] = data[((length - 4) - i + (width * 4)) - effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL]];
data[((length - 4) - i + (width * 4)) + 1] = data[((length - 4) - i + (width * 4)) - effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] + 1];
data[((length - 4) - i + (width * 4)) + 2] = data[((length - 4) - i + (width * 4)) - effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] + 2];
data[((length - 4) - i + (width * 4)) + 3] = data[((length - 4) - i + (width * 4)) - effectSliders[EFFECT_SLIDERS.DISTORTION_HORIZONTAL] + 3];
}
}
}
}
// iv) Increase red value only
if(effectBools[EFFECT_BOOLS.TINT_RED]){
// just the red channel this time
data[i] = data[i] + 100;
}
// v) invert every color channel
if(effectBools[EFFECT_BOOLS.INVERT]){
var red = data[i], green = data[i + 1], blue = data[i + 2];
data[i] = 255 - red;
data[i + 1] = 255 - green;
data[i + 2] = 255 - blue;
// We aren't messing with the alpha channel for hopefully obvious reasons
}
// vi) noise
if(effectBools[EFFECT_BOOLS.NOISE] && Math.random() < 0.10){
data[i] = data[i + 1] = data[i + 2] = 128; // gray noise
// data[i] = data[i + 1] = data[i + 2] = 255; // white noise
// data[i] = data[i + 1] = data[i + 2] = 0; // black noise
// Uncomment this line to draw noise on the black areas
// data[i + 3] = 255;
}
// vii) draw 2-pixel lines every 50 rows
if(effectBools[EFFECT_BOOLS.LINES]){
var row = Math.floor(i/4/width);
if(row % 50 == 0){
data[i] = data[i + 1] = data[i + 2] = data[i + 3] = 255;
// Took me a minute to realize why this draws black sometimes:
// It's only because of the inverted colors filter!
data[i + (width * 4)] =
data[i + (width * 4) + 1] =
data[i + (width * 4) + 2] =
data[i + (width * 4) + 3] = 255;
}
}
}
// Put the modified data back on the canvas
ctx.putImageData(imageData, 0, 0);
};
// HELPER
function makeColor(red, green, blue, alpha){
var color='rgba('+red+','+green+','+blue+', '+alpha+')';
return color;
};
// FULL SCREEN MODE
function requestFullscreen(element) {
if (element.requestFullscreen) {
element.requestFullscreen();
} else if (element.mozRequestFullscreen) {
element.mozRequestFullscreen();
} else if (element.mozRequestFullScreen) { // camel-cased 'S' was changed to 's' in spec
element.mozRequestFullScreen();
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullscreen();
}
// .. and do nothing if the method is not supported
};
// Make sure that the init() function is called when the page is done loading
window.addEventListener("load",init);
}());
</script>
</head>
<body>
<!-- Loading images for the canvases (is that the correct pluralization???) -->
<img id="bassImg" src="Bass.png" style="display:none" />
<img id="ampImg" src="Amp.png" style="display:none" />
<header>
<h1>Bass Guitar Visualizer</h1>
</header>
<section id="visualizer">
<canvas id="canvas2" title="Click me to switch views!" width="128" height="80"></canvas><br>
<canvas id="canvas" width="640" height="400"></canvas>
</section>
<section id="controls">
<button id="fsButton">Go Full Screen</button><br><br>
<section id="musicControls">
<audio controls loop></audio><br><br>
<label>Track:
<select id="trackSelect" >
<option value="media/☆ＳＥＩＮＷＡＶＥ☆２０００☆.mp3" selected>☆ＳＥＩＮＷＡＶＥ☆２０００☆</option>
<option value="media/The Doomsday.mp3">The Doomsday</option>
<option value="media/Artificial Intelligence Bomb.mp3">Artificial Intelligence Bomb</option>
</select>
</label>
</section>
<section id="effectsDiv" style="display: flex">
<section id="genVisualEffectsDiv" style="flex: 1">
<header>
<h2>General Visual Effects:</h2>
</header>
<label>Red Tint:
<input type="checkbox" id="redTintCheck">
</label>
<label>Invert Colors:
<input type="checkbox" id="invertCheck">
</label>
<label>Noise:
<input type="checkbox" id="noiseCheck">
</label>
<label>Lines:
<input type="checkbox" id="linesCheck">
</label><br><br>
<label>"Seeing Double" Distortion:
<input type="checkbox" id="distortionCheck"><br>
</label>
<label><!-- Horizontal: -->
<input type="range" min="0" max="640" step="4" value="0"/>
</label>
<label style="display: none">Vertical:
<input type="range" min="0" max="400" step="4" value="0"/>
</label>
</section>
<br>
<section id="audioEffectsDiv" style="flex: 1">
<header>
<h2>Audio Effects:</h2>
</header>
<label>Bass Boost:
<input id="boostSlider" type="range" min="0.0" max="20.0" step="1.0" value="0.0" />
</label><br>
<label>Audio Delay:
<input id="delaySlider" type="range" min="0.0" max="1.0" step="0.1" value="0.0" />
</label>
</section>
<br>
<section id="bassEffectsDiv" style="flex: 1">
<header>
<h2>Bass Guitar Effects:</h2>
</header>
<label>Weighted Strum:
<input type="checkbox" id="strumCheck">
</label>
<label>Divide waveform:
<input type="checkbox" id="divideCheck">
</label>
</section>
<br>
<section id="ampEffectsDiv" style="display: none; flex: 1">
<header>
<h2>Bass Amp Effects:</h2>
</header>
<label>Visualizer:
<select id="ampEffectSelect">
<option value="rectangles" selected>Rectangles</option>
<option value="circles">Circles</option>
<option value="bezier">Bezier Curves</option>
</select>
</label>
<br><br>
<label id="radiusLabel" style="display: none">Circle Radius:
<input id="radiusSlider" type="range" min="0" max="80" step="10" value="40"/>
</label>
<label id="gradientLabel">Gradient Fill:
<input id="gradientCheck" type="checkBox">
</label>
</section>
</section>
<p id="status">???</p>
</section>
</body>
</html>