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User: You said
Are there sound libraries in just client side javascript for sounds? For example pianos and others?
Gemini: Yes, there are several excellent client-side JavaScript libraries for this. They generally fall into two categories:
Sample-Based Libraries: These load actual audio recordings (samples) of real instruments. They sound the most realistic (like a real piano) but require downloading audio files.
Synthesis Libraries: These generate sound mathematically in real-time. They are tiny in file size and require no downloads, but they often sound “electronic” or like 8-bit video games.
Here are the best libraries for “pianos and others.”
- Tone.js (The Industry Standard)
This is the most popular library for web audio. It can do both synthesis and sampling.
Best for: Complex music apps, sequencers, and professional audio.
How it works for Pianos: You use the Sampler class to load individual .mp3 or .wav recordings of piano notes (e.g., C4, F4, A4). Tone.js automatically pitches them to fill in the gaps.
Code Example (Realistic Piano):
JavaScript // Import Tone.js first or use a CDN const sampler = new Tone.Sampler({ urls: { “C4”: “C4.mp3”, “D#4”: “Ds4.mp3”, “F#4”: “Fs4.mp3”, “A4”: “A4.mp3”, }, release: 1, baseUrl: “https://tonejs.github.io/audio/salamander/”, }).toDestination();
// Play Middle C (C4) Tone.loaded().then(() => { sampler.triggerAttackRelease(“C4”, “4n”); });
- Soundfont-Player (The Easiest for Instruments)
If you just want “a piano” or “a trumpet” without finding your own audio files, this is the best choice. It loads “SoundFonts” (standard MIDI instrument collections) directly from a URL.
Best for: Quickly accessing hundreds of standard instruments (General MIDI) like Piano, Violin, Guitar, Drums.
Pros: You don’t need to host sample files yourself; it streams them for you.
Code Example:
JavaScript // Requires including the soundfont-player script const ac = new AudioContext();
Soundfont.instrument(ac, ‘acoustic_grand_piano’).then(function (piano) { // Play the note C4 piano.play(‘C4’); });
- Audiosynth (Pure Synthesis)
This is an older but clever library that generates sounds entirely with math. It includes profiles for “Piano,” “Organ,” and “Acoustic” sounds.
Best for: Extremely lightweight apps (zero audio assets to download).
Cons: The “piano” sounds synthetic (like a cheap digital keyboard).
Code Example:
JavaScript // Creates a synthesizer instance var synth = new AudioSynth(); var piano = synth.createInstrument(‘piano’);
// Play note C, 4th octave, for 2 seconds piano.play(‘C’, 4, 2);
Summary Comparison Library Sound Quality Difficulty Best Use Case Tone.js High (Realistic) Medium Professional music apps Soundfont-Player Medium (GM Midi) Very Easy “I need a Violin/Piano right now” Audiosynth Low (Synthetic) Easy Offline / Zero-asset games Smplr High Easy Modern alternative to soundfont-player Export to Sheets Which one should you choose?
If you want it to sound like a real Grand Piano: Use Tone.js with a high-quality sample set (like the Salamander Piano samples used in the example above).
If you want to easily switch between “Piano”, “Flute”, and “Choir”: Use Soundfont-Player or the newer Smplr library.
User: You said
Let’s build audiosynth in just html css javascript. Is this only for instruments or any kind of sound possible? Tell if there are other natives and libraries as well.
Gemini: This is a great way to learn. Building with audiosynth (a specific library) is very easy, but it has specific limitations.
To answer your first question: Audiosynth is designed primarily for tonal instruments (Piano, Organ, Guitar, EDM). It generates sound using mathematical waveforms (sine, square, sawtooth) at specific pitches.
If you want “any kind of sound” (like an explosion, a dog bark, or a human voice), you generally cannot use audiosynth. For those, you would either need to load an MP3 recording (sampling) or use the native Web Audio API to generate complex noise buffers (synthesis).
Part 1: Building a Piano with audiosynth
Here is a complete, single-file solution. You can save this as an .html file and open it in your browser. It uses the audiosynth library via a CDN.
HTML <!DOCTYPE html>
JavaScript AudioSynth
Part 2: What if you want Any sound? (Native Web Audio API)
If you want to make sounds like white noise (static), sci-fi sirens, or complex textures without loading mp3 files, you don’t need a library. You can use the browser’s native Web Audio API.
This is “harder” but infinitely more powerful.
Example: Generating “White Noise” (Static TV sound) This does not require any external library.
JavaScript const audioCtx = new (window.AudioContext || window.webkitAudioContext)();
function playStatic() { // 1. Create an empty buffer (2 seconds long) const bufferSize = audioCtx.sampleRate * 2; const buffer = audioCtx.createBuffer(1, bufferSize, audioCtx.sampleRate); const data = buffer.getChannelData(0);
// 2. Fill the buffer with random noise (math!)
for (let i = 0; i < bufferSize; i++) {
// Random value between -1 and 1
data[i] = Math.random() * 2 - 1;
}
// 3. Create a source and play it
const noise = audioCtx.createBufferSource();
noise.buffer = buffer;
noise.connect(audioCtx.destination);
noise.start(); }
Summary of Options Technology Type Good For AudioSynth.js Library Tiny synthesizers (Piano, Organ). Easy to use. Howler.js Library Playing MP3/WAV files (Game SFX, Music playlists). Tone.js Library The best all-rounder. Can do sampling AND synthesis. Professional grade. Web Audio API Native Building your own synthesizer or audio engine from scratch. Export to Sheets
Next Step: Would you like to see how to use Tone.js instead? It is currently the industry standard for web audio because it sounds much better than audiosynth while remaining easier to use than the native API.
User: You said
Mine still does not work yet:
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple JS Piano</title>
<style>
body { font-family: sans-serif; text-align: center; background: #222; color: white; padding-top: 50px; }
.piano { display: flex; justify-content: center; gap: 5px; }
.key {
width: 60px; height: 200px; background: white; border-radius: 0 0 5px 5px;
cursor: pointer; color: black; display: flex; align-items: flex-end;
justify-content: center; padding-bottom: 20px; font-weight: bold;
transition: background 0.1s; user-select: none;
}
.key:active { background: #ddd; transform: scale(0.98); }
.controls { margin-bottom: 20px; }
button { padding: 10px 20px; cursor: pointer; font-size: 16px; }
</style>
</head>
<body>
<h1>JavaScript AudioSynth</h1>
<div class="controls">
<label>Instrument: </label>
<select id="instrument-select">
<option value="0">Piano</option>
<option value="1">Organ</option>
<option value="2">Acoustic Guitar</option>
<option value="3">EDM</option>
</select>
</div>
<div class="piano">
<div class="key" onclick="playNote('C', 4)">C</div>
<div class="key" onclick="playNote('D', 4)">D</div>
<div class="key" onclick="playNote('E', 4)">E</div>
<div class="key" onclick="playNote('F', 4)">F</div>
<div class="key" onclick="playNote('G', 4)">G</div>
<div class="key" onclick="playNote('A', 4)">A</div>
<div class="key" onclick="playNote('B', 4)">B</div>
</div>
<script src="audiosynth.js"></script>
<script>
// 1. Create the AudioSynth Instance
// AudioSynth is a singleton in this library, accessed via 'Synth'
function playNote(note, octave) {
// Get selected instrument ID from the dropdown
const instrumentId = document.getElementById('instrument-select').value;
// Create the instrument (0=Piano, 1=Organ, 2=Acoustic, 3=EDM)
const instrument = Synth.createInstrument(instrumentId);
// Play the note: Note Name, Octave, Duration (seconds)
instrument.play(note, octave, 2);
}
</script>
</body>
</html>
audiosynth.js
var Synth, AudioSynth, AudioSynthInstrument;
!function(){
var URL = window.URL || window.webkitURL;
var Blob = window.Blob;
if(!URL || !Blob) {
throw new Error('This browser does not support AudioSynth');
}
var _encapsulated = false;
var AudioSynthInstance = null;
var pack = function(c,arg){ return [new Uint8Array([arg, arg >> 8]), new Uint8Array([arg, arg >> 8, arg >> 16, arg >> 24])][c]; };
var setPrivateVar = function(n,v,w,e){Object.defineProperty(this,n,{value:v,writable:!!w,enumerable:!!e});};
var setPublicVar = function(n,v,w){setPrivateVar.call(this,n,v,w,true);};
AudioSynthInstrument = function AudioSynthInstrument(){this.__init__.apply(this,arguments);};
var setPriv = setPrivateVar.bind(AudioSynthInstrument.prototype);
var setPub = setPublicVar.bind(AudioSynthInstrument.prototype);
setPriv('__init__', function(a,b,c) {
if(!_encapsulated) { throw new Error('AudioSynthInstrument can only be instantiated from the createInstrument method of the AudioSynth object.'); }
setPrivateVar.call(this, '_parent', a);
setPublicVar.call(this, 'name', b);
setPrivateVar.call(this, '_soundID', c);
});
setPub('play', function(note, octave, duration) {
return this._parent.play(this._soundID, note, octave, duration);
});
setPub('generate', function(note, octave, duration) {
return this._parent.generate(this._soundID, note, octave, duration);
});
AudioSynth = function AudioSynth(){if(AudioSynthInstance instanceof AudioSynth){return AudioSynthInstance;}else{ this.__init__(); return this; }};
setPriv = setPrivateVar.bind(AudioSynth.prototype);
setPub = setPublicVar.bind(AudioSynth.prototype);
setPriv('_debug',false,true);
setPriv('_bitsPerSample',16);
setPriv('_channels',1);
setPriv('_sampleRate',44100,true);
setPub('setSampleRate', function(v) {
this._sampleRate = Math.max(Math.min(v|0,44100), 4000);
this._clearCache();
return this._sampleRate;
});
setPub('getSampleRate', function() { return this._sampleRate; });
setPriv('_volume',32768,true);
setPub('setVolume', function(v) {
v = parseFloat(v); if(isNaN(v)) { v = 0; }
v = Math.round(v*32768);
this._volume = Math.max(Math.min(v|0,32768), 0);
this._clearCache();
return this._volume;
});
setPub('getVolume', function() { return Math.round(this._volume/32768*10000)/10000; });
setPriv('_notes',{'C':261.63,'C#':277.18,'D':293.66,'D#':311.13,'E':329.63,'F':349.23,'F#':369.99,'G':392.00,'G#':415.30,'A':440.00,'A#':466.16,'B':493.88});
setPriv('_fileCache',[],true);
setPriv('_temp',{},true);
setPriv('_sounds',[],true);
setPriv('_mod',[function(i,s,f,x){return Math.sin((2 * Math.PI)*(i/s)*f+x);}]);
setPriv('_resizeCache', function() {
var f = this._fileCache;
var l = this._sounds.length;
while(f.length<l) {
var octaveList = [];
for(var i = 0; i < 8; i++) {
var noteList = {};
for(var k in this._notes) {
noteList[k] = {};
}
octaveList.push(noteList);
}
f.push(octaveList);
}
});
setPriv('_clearCache', function() {
this._fileCache = [];
this._resizeCache();
});
setPub('generate', function(sound, note, octave, duration) {
var thisSound = this._sounds[sound];
if(!thisSound) {
for(var i=0;i<this._sounds.length;i++) {
if(this._sounds[i].name==sound) {
thisSound = this._sounds[i];
sound = i;
break;
}
}
}
if(!thisSound) { throw new Error('Invalid sound or sound ID: ' + sound); }
var t = (new Date).valueOf();
this._temp = {};
octave |= 0;
octave = Math.min(8, Math.max(1, octave));
var time = !duration?2:parseFloat(duration);
if(typeof(this._notes[note])=='undefined') { throw new Error(note + ' is not a valid note.'); }
if(typeof(this._fileCache[sound][octave-1][note][time])!='undefined') {
if(this._debug) { console.log((new Date).valueOf() - t, 'ms to retrieve (cached)'); }
return this._fileCache[sound][octave-1][note][time];
} else {
var frequency = this._notes[note] * Math.pow(2,octave-4);
var sampleRate = this._sampleRate;
var volume = this._volume;
var channels = this._channels;
var bitsPerSample = this._bitsPerSample;
var attack = thisSound.attack(sampleRate, frequency, volume);
var dampen = thisSound.dampen(sampleRate, frequency, volume);
var waveFunc = thisSound.wave;
var waveBind = {modulate: this._mod, vars: this._temp};
var val = 0;
var curVol = 0;
var data = new Uint8Array(new ArrayBuffer(Math.ceil(sampleRate * time * 2)));
var attackLen = (sampleRate * attack) | 0;
var decayLen = (sampleRate * time) | 0;
for (var i = 0 | 0; i !== attackLen; i++) {
val = volume * (i/(sampleRate*attack)) * waveFunc.call(waveBind, i, sampleRate, frequency, volume);
data[i << 1] = val;
data[(i << 1) + 1] = val >> 8;
}
for (; i !== decayLen; i++) {
val = volume * Math.pow((1-((i-(sampleRate*attack))/(sampleRate*(time-attack)))),dampen) * waveFunc.call(waveBind, i, sampleRate, frequency, volume);
data[i << 1] = val;
data[(i << 1) + 1] = val >> 8;
}
var out = [
'RIFF',
pack(1, 4 + (8 + 24/* chunk 1 length */) + (8 + 8/* chunk 2 length */)), // Length
'WAVE',
// chunk 1
'fmt ', // Sub-chunk identifier
pack(1, 16), // Chunk length
pack(0, 1), // Audio format (1 is linear quantization)
pack(0, channels),
pack(1, sampleRate),
pack(1, sampleRate * channels * bitsPerSample / 8), // Byte rate
pack(0, channels * bitsPerSample / 8),
pack(0, bitsPerSample),
// chunk 2
'data', // Sub-chunk identifier
pack(1, data.length * channels * bitsPerSample / 8), // Chunk length
data
];
var blob = new Blob(out, {type: 'audio/wav'});
var dataURI = URL.createObjectURL(blob);
this._fileCache[sound][octave-1][note][time] = dataURI;
if(this._debug) { console.log((new Date).valueOf() - t, 'ms to generate'); }
return dataURI;
}
});
setPub('play', function(sound, note, octave, duration) {
var src = this.generate(sound, note, octave, duration);
var audio = new Audio(src);
audio.play();
return true;
});
setPub('debug', function() { this._debug = true; });
setPub('createInstrument', function(sound) {
var n = 0;
var found = false;
if(typeof(sound)=='string') {
for(var i=0;i<this._sounds.length;i++) {
if(this._sounds[i].name==sound) {
found = true;
n = i;
break;
}
}
} else {
if(this._sounds[sound]) {
n = sound;
sound = this._sounds[n].name;
found = true;
}
}
if(!found) { throw new Error('Invalid sound or sound ID: ' + sound); }
_encapsulated = true;
var ins = new AudioSynthInstrument(this, sound, n);
_encapsulated = false;
return ins;
});
setPub('listSounds', function() {
var r = [];
for(var i=0;i<this._sounds.length;i++) {
r.push(this._sounds[i].name);
}
return r;
});
setPriv('__init__', function(){
this._resizeCache();
});
setPub('loadSoundProfile', function() {
for(var i=0,len=arguments.length;i<len;i++) {
o = arguments[i];
if(!(o instanceof Object)) { throw new Error('Invalid sound profile.'); }
this._sounds.push(o);
}
this._resizeCache();
return true;
});
setPub('loadModulationFunction', function() {
for(var i=0,len=arguments.length;i<len;i++) {
f = arguments[i];
if(typeof(f)!='function') { throw new Error('Invalid modulation function.'); }
this._mod.push(f);
}
return true;
});
AudioSynthInstance = new AudioSynth();
Synth = AudioSynthInstance;
}();
Synth.loadModulationFunction(
function(i, sampleRate, frequency, x) { return 1 * Math.sin(2 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(4 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(8 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(0.5 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(0.25 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(2 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(4 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(8 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(0.5 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(0.25 * Math.PI * ((i / sampleRate) * frequency) + x); }
);
Synth.loadSoundProfile({
name: 'piano',
attack: function() { return 0.002; },
dampen: function(sampleRate, frequency, volume) {
return Math.pow(0.5*Math.log((frequency*volume)/sampleRate),2);
},
wave: function(i, sampleRate, frequency, volume) {
var base = this.modulate[0];
return this.modulate[1](
i,
sampleRate,
frequency,
Math.pow(base(i, sampleRate, frequency, 0), 2) +
(0.75 * base(i, sampleRate, frequency, 0.25)) +
(0.1 * base(i, sampleRate, frequency, 0.5))
);
}
},
{
name: 'organ',
attack: function() { return 0.3 },
dampen: function(sampleRate, frequency) { return 1+(frequency * 0.01); },
wave: function(i, sampleRate, frequency) {
var base = this.modulate[0];
return this.modulate[1](
i,
sampleRate,
frequency,
base(i, sampleRate, frequency, 0) +
0.5*base(i, sampleRate, frequency, 0.25) +
0.25*base(i, sampleRate, frequency, 0.5)
);
}
},
{
name: 'acoustic',
attack: function() { return 0.002; },
dampen: function() { return 1; },
wave: function(i, sampleRate, frequency) {
var vars = this.vars;
vars.valueTable = !vars.valueTable?[]:vars.valueTable;
if(typeof(vars.playVal)=='undefined') { vars.playVal = 0; }
if(typeof(vars.periodCount)=='undefined') { vars.periodCount = 0; }
var valueTable = vars.valueTable;
var playVal = vars.playVal;
var periodCount = vars.periodCount;
var period = sampleRate/frequency;
var p_hundredth = Math.floor((period-Math.floor(period))*100);
var resetPlay = false;
if(valueTable.length<=Math.ceil(period)) {
valueTable.push(Math.round(Math.random())*2-1);
return valueTable[valueTable.length-1];
} else {
valueTable[playVal] = (valueTable[playVal>=(valueTable.length-1)?0:playVal+1] + valueTable[playVal]) * 0.5;
if(playVal>=Math.floor(period)) {
if(playVal<Math.ceil(period)) {
if((periodCount%100)>=p_hundredth) {
// Reset
resetPlay = true;
valueTable[playVal+1] = (valueTable[0] + valueTable[playVal+1]) * 0.5;
vars.periodCount++;
}
} else {
resetPlay = true;
}
}
var _return = valueTable[playVal];
if(resetPlay) { vars.playVal = 0; } else { vars.playVal++; }
return _return;
}
}
},
{
name: 'edm',
attack: function() { return 0.002; },
dampen: function() { return 1; },
wave: function(i, sampleRate, frequency) {
var base = this.modulate[0];
var mod = this.modulate.slice(1);
return mod[0](
i,
sampleRate,
frequency,
mod[9](
i,
sampleRate,
frequency,
mod[2](
i,
sampleRate,
frequency,
Math.pow(base(i, sampleRate, frequency, 0), 3) +
Math.pow(base(i, sampleRate, frequency, 0.5), 5) +
Math.pow(base(i, sampleRate, frequency, 1), 7)
)
) +
mod[8](
i,
sampleRate,
frequency,
base(i, sampleRate, frequency, 1.75)
)
);
}
});
Readme.md:
audiosynth
==========
Dynamic waveform audio synthesizer, written in Javascript.
Generate musical notes dynamically
and play them in your browser using the HTML5 Audio Element.
No static files required. (Besides the source, of course!)
Demo
----
To see a demo of audiosynth in action, visit http://keithwhor.com/music/
Installation
------------
Assuming audiosynth.js is in your current directory, import package using:
```html
<script src="audiosynth.js"></script>
Usage
audiosynth implements a singleton class, AudioSynth. By default, the global (window) variable Synth
is the instance of the class.
Any attempt to instantiate new AudioSynth object will only create references to
the original object.
Synth instanceof AudioSynth; // true
var testInstance = new AudioSynth;
testInstance instanceof AudioSynth; // true
testInstance === Synth; // true
To use AudioSynth to generate .WAV files…
Synth.generate(sound, note, octave, duration);
/*
Will generate a base64-encoded dataURI wavefile (.WAV) containing your data.
sound
a numeric index or string referring to a sound profile (by id or name, respectively)
note
the note you wish to play (A,B,C,D,E,F,G). Supports sharps (i.e. C#) but not flats.
(Use the respective sharp!)
octave
the octave # of the note you wish to play
duration
the duration (in seconds) of the note
*/
You can play notes instantly using…
/*
Same arguments as Synth.generate,
only this creates an HTML Audio element, plays it, and unloads it upon completion.
*/
Synth.play(sound, note, octave, duration);
You may also create individual instruments (objects that reference .generate and .play, bound to specific
sounds).
var piano = Synth.createInstrument('piano');
piano.play('C', 4, 2); // plays C4 for 2s using the 'piano' sound profile
Sound Profiles
AudioSynth comes with four default sound profiles.
piano (id 0)
organ (id 1)
acoustic (id 2)
edm (id 3)
var acoustic = Synth.createInstrument('acoustic'); // play with your acoustic guitar!
Changing Settings
Poor performance? The default sampling rate for AudioSynth is 44100Hz (CD quality). This can be taxing on your browser.
To change the sampling rate, use Synth.setSampleRate(n)
Please note that lower sampling rates will equate to poorer sound quality, especially for higher notes.
// Can only set values between 4000Hz and 44100Hz.
Synth.setSampleRate(20000); // sets sample rate to 20000Hz
Synth.getSampleRate(); // returns 20000
Volume a bit much? Adust the volume of the sample similarly.
Synth.setVolume(1.00); // set volume to 100%
Synth.setVolume(0.40); // no, wait, 40%.
Synth.setVolume(0.1337); // even better.
Synth.getVolume(); // returns 0.1337
Advanced Usage
Additional sound profiles can be loaded using Synth.loadSoundProfile()
// Load a sound profile from an object...
Synth.loadSoundProfile({
// name it
name: 'my_sound',
// WIP: return the length of time, in seconds, the attack lasts
attack: function(sampleRate, frequency, volume) { ... },
// WIP: return a number representing the rate of signal decay.
// larger = faster decay
dampen: function(sampleRate, frequency, volume) { ... },
// wave function: calculate the amplitude of your sine wave based on i (index)
wave: function(i, sampleRate, frequency, volume) {
/*
Here we have access to...
this.modulate : an array of loaded frequency
this.vars : any temporary variables you wish to keep track of
*/
}
});
A rough guide to waveform generation can be found at http://keithwhor.com/music/
Debugging
If you’re hanging on note generation (for default or custom sound profiles), use Synth.debug()
to enable debugging.
This will log note generation times in your console.
Credits and Acknowledgements
Special thanks to Albert Pham (http://www.sk89q.com/) for Dynamic .WAV file generation,
the work off of which this is based (http://www.sk89q.com/playground/jswav/)
and Hasen el Judy (http://dev.hasenj.org/post/4517734448) for information regarding Karplus-Strong
String Synthesis.
Further Reading
.WAV Audio Files
http://en.wikipedia.org/wiki/.WAV_file
Sound Synthesis
http://www.acoustics.salford.ac.uk/acoustics_info/sound_synthesis/
“acoustic” sound profile generated using Karplus-Strong String Synthesis:
http://en.wikipedia.org/wiki/Karplus%E2%80%93Strong_string_synthesis
http://music.columbia.edu/cmc/musicandcomputers/chapter4/04_09.php
Contact
Feel free to e-mail me at keithwhor at gmail dot com
or follow me on Twitter, @keithwhor
If you like, feel free to share! :) Always appreciated.
---
**Gemini:**
The reason it is not working is a subtle data type mismatch.
When you get the value from your <select> dropdown (document.getElementById('instrument-select').value), it returns a String (e.g., "0").
However, the audiosynth.js library has logic that says:
If the input is a String, look for an instrument with that Name (e.g., "piano").
If the input is a Number, look for an instrument with that ID (e.g., 0).
Because you are passing the string "0", the library searches for an instrument named "0", doesn't find it, and crashes.
Here are two ways to fix it (choose one):
Fix 1: Change HTML Values to Names (Recommended)
This is the cleaner solution. Update your <select> options in index.html to use the actual names expected by the library.
HTML
<div class="controls">
<label>Instrument: </label>
<select id="instrument-select">
<option value="piano">Piano</option>
<option value="organ">Organ</option>
<option value="acoustic">Acoustic Guitar</option>
<option value="edm">EDM</option>
</select>
</div>
Fix 2: Convert to Number in JavaScript
If you want to keep the numbers in your HTML, you must force the value to be a number using parseInt() inside your script.
JavaScript
function playNote(note, octave) {
// Get the value (e.g., "0")
const val = document.getElementById('instrument-select').value;
// Convert "0" (String) to 0 (Integer)
const instrumentId = parseInt(val);
// Now creates instrument 0 correctly
const instrument = Synth.createInstrument(instrumentId);
instrument.play(note, octave, 2);
}
Troubleshooting Tips
If it still doesn't make sound after applying the fix above:
Check the Console: Press F12 -> Click "Console". If you see Invalid sound or sound ID, the fix above wasn't applied correctly.
First Click Lag: This library generates the audio file (WAV) on the fly the first time you press a specific key. There might be a split-second delay on the very first click of a key, but subsequent clicks will be instant because it caches the sound.
Volume: Ensure your system volume is up; the generated sine waves can sometimes be quiet depending on speakers.
---
**User:**
You said
Next project with different html css js. Is it possible to create an interface to live try synthesizing sounds which in the end we can export to sound profile? For example this one is Piano and I want to try something random live:
Synth.loadSoundProfile({
name: 'piano',
attack: function() { return 0.002; },
dampen: function(sampleRate, frequency, volume) {
return Math.pow(0.5*Math.log((frequency*volume)/sampleRate),2);
},
wave: function(i, sampleRate, frequency, volume) {
var base = this.modulate[0];
return this.modulate[1](
i,
sampleRate,
frequency,
Math.pow(base(i, sampleRate, frequency, 0), 2) +
(0.75 * base(i, sampleRate, frequency, 0.25)) +
(0.1 * base(i, sampleRate, frequency, 0.5))
);
}
}
---
**Gemini:**
Yes, this is absolutely possible and is a fantastic way to learn audio synthesis.
To make this work "Live," we need to use a JavaScript feature called new Function(). This allows us to take the text string from a textarea (what you type) and turn it into executable code that the audiosynth library can run.
Here is a complete "Synth Laboratory" project. It includes a code editor for the Attack, Dampen, and Wave functions, a test button, and an export feature.
The Synth Lab
Save this as index.html. It assumes audiosynth.js is in the same folder (or it will fetch it from a CDN if you don't have it).
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>JS Synth Lab</title>
<style>
:root { --bg: #1e1e1e; --panel: #2d2d2d; --text: #e0e0e0; --accent: #007acc; }
body { font-family: 'Consolas', 'Monaco', monospace; background: var(--bg); color: var(--text); margin: 0; padding: 20px; display: flex; gap: 20px; height: 100vh; box-sizing: border-box; }
/* Layout */
.editor-column { flex: 2; display: flex; flex-direction: column; gap: 15px; overflow-y: auto; }
.preview-column { flex: 1; background: var(--panel); padding: 20px; border-radius: 8px; display: flex; flex-direction: column; gap: 20px; }
/* Editors */
.code-block { display: flex; flex-direction: column; gap: 5px; }
label { font-weight: bold; color: #85c6f0; }
.args { font-size: 0.8em; color: #888; margin-bottom: 5px; }
textarea {
background: #111; border: 1px solid #444; color: #d4d4d4;
font-family: inherit; font-size: 14px; padding: 10px; border-radius: 5px;
width: 100%; height: 120px; resize: vertical; box-sizing: border-box;
tab-size: 4;
}
textarea#wave-code { height: 200px; } /* Wave needs more space */
/* Controls */
button {
background: var(--accent); color: white; border: none; padding: 15px;
font-size: 16px; font-weight: bold; cursor: pointer; border-radius: 5px;
transition: opacity 0.2s;
}
button:hover { opacity: 0.9; }
button.play-btn { width: 100%; margin-bottom: 5px; }
.piano-strip { display: flex; gap: 2px; justify-content: center; }
.key {
background: white; color: black; width: 40px; height: 100px;
display: flex; align-items: flex-end; justify-content: center;
padding-bottom: 10px; cursor: pointer; user-select: none;
font-weight: bold; font-family: sans-serif;
}
.key:active { background: #ccc; }
/* Output */
#error-log { color: #ff6b6b; font-size: 0.9em; min-height: 20px; }
#export-area { background: #111; color: #aaa; padding: 10px; font-size: 0.8em; white-space: pre-wrap; word-break: break-all; }
</style>
</head>
<body>
<div class="editor-column">
<h2>🎛️ Synth Profiler</h2>
<div class="code-block">
<label>Attack Function</label>
<span class="args">Arguments: (sampleRate, frequency, volume)</span>
<textarea id="attack-code">return 0.002;</textarea>
</div>
<div class="code-block">
<label>Dampen Function</label>
<span class="args">Arguments: (sampleRate, frequency, volume)</span>
<textarea id="dampen-code">
return Math.pow(0.5*Math.log((frequency*volume)/sampleRate),2);</textarea>
</div>
<div class="code-block">
<label>Wave Function</label>
<span class="args">Arguments: (i, sampleRate, frequency, volume)</span>
<textarea id="wave-code">
var base = this.modulate[0];
return this.modulate[1](
i,
sampleRate,
frequency,
Math.pow(base(i, sampleRate, frequency, 0), 2) +
(0.75 * base(i, sampleRate, frequency, 0.25)) +
(0.1 * base(i, sampleRate, frequency, 0.5))
);</textarea>
</div>
</div>
<div class="preview-column">
<h3>Test Sound</h3>
<div id="error-log"></div>
<button onclick="testSound('C', 4)" class="play-btn">Test: C4 (Middle C)</button>
<div class="piano-strip">
<div class="key" onclick="testSound('C', 3)">C3</div>
<div class="key" onclick="testSound('E', 3)">E3</div>
<div class="key" onclick="testSound('G', 3)">G3</div>
<div class="key" onclick="testSound('C', 4)">C4</div>
</div>
<h3>Export Profile</h3>
<button onclick="generateExport()">Generate Code</button>
<div id="export-area">// Click Generate to see code</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/audiosynth@0.0.5/index.min.js"></script>
<script>
// Ensure modulation functions are loaded (standard library setup)
// This is required so 'this.modulate' works in your Wave function
if(window.Synth) {
// Re-asserting default modulators if needed, usually loaded by default in the lib
}
function getUserFunctions() {
const attackBody = document.getElementById('attack-code').value;
const dampenBody = document.getElementById('dampen-code').value;
const waveBody = document.getElementById('wave-code').value;
try {
// Creates real JS functions from the text strings
const attackFunc = new Function('sampleRate', 'frequency', 'volume', attackBody);
const dampenFunc = new Function('sampleRate', 'frequency', 'volume', dampenBody);
const waveFunc = new Function('i', 'sampleRate', 'frequency', 'volume', waveBody);
document.getElementById('error-log').innerText = ""; // Clear errors
return { attackFunc, dampenFunc, waveFunc };
} catch (e) {
document.getElementById('error-log').innerText = "Syntax Error: " + e.message;
return null;
}
}
function testSound(note, octave) {
const funcs = getUserFunctions();
if(!funcs) return;
// TRICK: We create a UNIQUE name every time we click.
// Why? audiosynth caches sounds. If we use the same name,
// it won't run your updated code, it will just play the old sound.
const tempName = "preview_" + Date.now();
// Load the profile into the library
Synth.loadSoundProfile({
name: tempName,
attack: funcs.attackFunc,
dampen: funcs.dampenFunc,
wave: funcs.waveFunc
});
// Create and play
const instrument = Synth.createInstrument(tempName);
instrument.play(note, octave, 2);
}
function generateExport() {
const attackBody = document.getElementById('attack-code').value;
const dampenBody = document.getElementById('dampen-code').value;
const waveBody = document.getElementById('wave-code').value;
const exportStr = `
Synth.loadSoundProfile({
name: 'my_custom_sound',
attack: function(sampleRate, frequency, volume) {
${attackBody.replace(/\n/g, '\n ')}
},
dampen: function(sampleRate, frequency, volume) {
${dampenBody.replace(/\n/g, '\n ')}
},
wave: function(i, sampleRate, frequency, volume) {
${waveBody.replace(/\n/g, '\n ')}
}
});`;
document.getElementById('export-area').innerText = exportStr;
}
</script>
</body>
</html>
How to use this Lab
Attack: This controls how fast the sound starts.
return 0.002 is very fast (instant hit, like a piano).
return 0.5 is slow (fades in, like a violin).
Dampen: This controls how fast the sound dies out.
Higher return values = fades out faster.
Wave: This is the math that makes the tone.
this.modulate[0] is a Sine wave.
this.modulate[1] is a slightly different Sine wave.
You are mixing these together using math.
Try this Random Experiment
Paste this into the Wave box in the interface to hear a "Distorted Game Boy" sound:
JavaScript
// Simple Square Wave Logic
var val = Math.sin(2 * Math.PI * frequency * (i / sampleRate));
return val > 0 ? 0.5 : -0.5;
---
**User:**
You said
It works, but back to the whole code:
var Synth, AudioSynth, AudioSynthInstrument;
!function(){
| var URL = window.URL | window.webkitURL; |
var Blob = window.Blob;
| if(!URL | !Blob) { |
throw new Error(‘This browser does not support AudioSynth’);
}
var _encapsulated = false;
var AudioSynthInstance = null;
var pack = function(c,arg){ return [new Uint8Array([arg, arg » 8]), new Uint8Array([arg, arg » 8, arg » 16, arg » 24])][c]; };
var setPrivateVar = function(n,v,w,e){Object.defineProperty(this,n,{value:v,writable:!!w,enumerable:!!e});};
var setPublicVar = function(n,v,w){setPrivateVar.call(this,n,v,w,true);};
AudioSynthInstrument = function AudioSynthInstrument(){this.init.apply(this,arguments);};
var setPriv = setPrivateVar.bind(AudioSynthInstrument.prototype);
var setPub = setPublicVar.bind(AudioSynthInstrument.prototype);
setPriv(‘init’, function(a,b,c) {
if(!_encapsulated) { throw new Error(‘AudioSynthInstrument can only be instantiated from the createInstrument method of the AudioSynth object.’); }
setPrivateVar.call(this, ‘_parent’, a);
setPublicVar.call(this, ‘name’, b);
setPrivateVar.call(this, ‘_soundID’, c);
});
setPub(‘play’, function(note, octave, duration) {
return this._parent.play(this._soundID, note, octave, duration);
});
setPub(‘generate’, function(note, octave, duration) {
return this._parent.generate(this._soundID, note, octave, duration);
});
AudioSynth = function AudioSynth(){if(AudioSynthInstance instanceof AudioSynth){return AudioSynthInstance;}else{ this.init(); return this; }};
setPriv = setPrivateVar.bind(AudioSynth.prototype);
setPub = setPublicVar.bind(AudioSynth.prototype);
setPriv(‘_debug’,false,true);
setPriv(‘_bitsPerSample’,16);
setPriv(‘_channels’,1);
setPriv(‘_sampleRate’,44100,true);
setPub(‘setSampleRate’, function(v) {
| this._sampleRate = Math.max(Math.min(v | 0,44100), 4000); |
this._clearCache();
return this._sampleRate;
});
setPub(‘getSampleRate’, function() { return this._sampleRate; });
setPriv(‘_volume’,32768,true);
setPub(‘setVolume’, function(v) {
v = parseFloat(v); if(isNaN(v)) { v = 0; }
v = Math.round(v*32768);
| this._volume = Math.max(Math.min(v | 0,32768), 0); |
this._clearCache();
return this._volume;
});
setPub(‘getVolume’, function() { return Math.round(this._volume/32768*10000)/10000; });
setPriv(‘_notes’,{‘C’:261.63,’C#’:277.18,’D’:293.66,’D#’:311.13,’E’:329.63,’F’:349.23,’F#’:369.99,’G’:392.00,’G#’:415.30,’A’:440.00,’A#’:466.16,’B’:493.88});
setPriv(‘_fileCache’,[],true);
setPriv(‘_temp’,{},true);
setPriv(‘_sounds’,[],true);
setPriv(‘_mod’,[function(i,s,f,x){return Math.sin((2 * Math.PI)(i/s)f+x);}]);
setPriv(‘_resizeCache’, function() {
var f = this._fileCache;
var l = this._sounds.length;
while(f.length<l) {
var octaveList = [];
for(var i = 0; i < 8; i++) {
var noteList = {};
for(var k in this._notes) {
noteList[k] = {};
}
octaveList.push(noteList);
}
f.push(octaveList);
}
});
setPriv(‘_clearCache’, function() {
this._fileCache = [];
this._resizeCache();
});
setPub(‘generate’, function(sound, note, octave, duration) {
var thisSound = this._sounds[sound];
if(!thisSound) {
for(var i=0;i<this._sounds.length;i++) {
if(this._sounds[i].name==sound) {
thisSound = this._sounds[i];
sound = i;
break;
}
}
}
if(!thisSound) { throw new Error(‘Invalid sound or sound ID: ‘ + sound); }
var t = (new Date).valueOf();
this._temp = {};
| octave | = 0; |
octave = Math.min(8, Math.max(1, octave));
var time = !duration?2:parseFloat(duration);
if(typeof(this._notes[note])==’undefined’) { throw new Error(note + ‘ is not a valid note.’); }
if(typeof(this._fileCache[sound][octave-1][note][time])!=’undefined’) {
if(this._debug) { console.log((new Date).valueOf() - t, ‘ms to retrieve (cached)’); }
return this._fileCache[sound][octave-1][note][time];
} else {
var frequency = this._notes[note] * Math.pow(2,octave-4);
var sampleRate = this._sampleRate;
var volume = this._volume;
var channels = this._channels;
var bitsPerSample = this._bitsPerSample;
var attack = thisSound.attack(sampleRate, frequency, volume);
var dampen = thisSound.dampen(sampleRate, frequency, volume);
var waveFunc = thisSound.wave;
var waveBind = {modulate: this._mod, vars: this._temp};
var val = 0;
var curVol = 0;
var data = new Uint8Array(new ArrayBuffer(Math.ceil(sampleRate * time * 2)));
| var attackLen = (sampleRate * attack) | 0; |
| var decayLen = (sampleRate * time) | 0; |
| for (var i = 0 | 0; i !== attackLen; i++) { |
val = volume * (i/(sampleRate*attack)) * waveFunc.call(waveBind, i, sampleRate, frequency, volume);
data[i « 1] = val;
data[(i « 1) + 1] = val » 8;
}
for (; i !== decayLen; i++) {
val = volume * Math.pow((1-((i-(sampleRateattack))/(sampleRate(time-attack)))),dampen) * waveFunc.call(waveBind, i, sampleRate, frequency, volume);
data[i « 1] = val;
data[(i « 1) + 1] = val » 8;
}
var out = [
‘RIFF’,
pack(1, 4 + (8 + 24/* chunk 1 length /) + (8 + 8/ chunk 2 length */)), // Length
‘WAVE’,
// chunk 1
‘fmt ‘, // Sub-chunk identifier
pack(1, 16), // Chunk length
pack(0, 1), // Audio format (1 is linear quantization)
pack(0, channels),
pack(1, sampleRate),
pack(1, sampleRate * channels * bitsPerSample / 8), // Byte rate
pack(0, channels * bitsPerSample / 8),
pack(0, bitsPerSample),
// chunk 2
‘data’, // Sub-chunk identifier
pack(1, data.length * channels * bitsPerSample / 8), // Chunk length
data
];
var blob = new Blob(out, {type: ‘audio/wav’});
var dataURI = URL.createObjectURL(blob);
this._fileCache[sound][octave-1][note][time] = dataURI;
if(this._debug) { console.log((new Date).valueOf() - t, ‘ms to generate’); }
return dataURI;
}
});
setPub(‘play’, function(sound, note, octave, duration) {
var src = this.generate(sound, note, octave, duration);
var audio = new Audio(src);
audio.play();
return true;
});
setPub(‘debug’, function() { this._debug = true; });
setPub(‘createInstrument’, function(sound) {
var n = 0;
var found = false;
if(typeof(sound)==’string’) {
for(var i=0;i<this._sounds.length;i++) {
if(this._sounds[i].name==sound) {
found = true;
n = i;
break;
}
}
} else {
if(this._sounds[sound]) {
n = sound;
sound = this._sounds[n].name;
found = true;
}
}
if(!found) { throw new Error(‘Invalid sound or sound ID: ‘ + sound); }
_encapsulated = true;
var ins = new AudioSynthInstrument(this, sound, n);
_encapsulated = false;
return ins;
});
setPub(‘listSounds’, function() {
var r = [];
for(var i=0;i<this._sounds.length;i++) {
r.push(this._sounds[i].name);
}
return r;
});
setPriv(‘init’, function(){
this._resizeCache();
});
setPub(‘loadSoundProfile’, function() {
for(var i=0,len=arguments.length;i<len;i++) {
o = arguments[i];
if(!(o instanceof Object)) { throw new Error(‘Invalid sound profile.’); }
this._sounds.push(o);
}
this._resizeCache();
return true;
});
setPub(‘loadModulationFunction’, function() {
for(var i=0,len=arguments.length;i<len;i++) {
f = arguments[i];
if(typeof(f)!=’function’) { throw new Error(‘Invalid modulation function.’); }
this._mod.push(f);
}
return true;
});
AudioSynthInstance = new AudioSynth();
Synth = AudioSynthInstance;
}();
Synth.loadModulationFunction(
function(i, sampleRate, frequency, x) { return 1 * Math.sin(2 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(4 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(8 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(0.5 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 1 * Math.sin(0.25 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(2 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(4 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(8 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(0.5 * Math.PI * ((i / sampleRate) * frequency) + x); },
function(i, sampleRate, frequency, x) { return 0.5 * Math.sin(0.25 * Math.PI * ((i / sampleRate) * frequency) + x); }
);
Synth.loadSoundProfile({
name: ‘piano’,
attack: function() { return 0.002; },
dampen: function(sampleRate, frequency, volume) {
return Math.pow(0.5Math.log((frequencyvolume)/sampleRate),2);
},
wave: function(i, sampleRate, frequency, volume) {
var base = this.modulate[0];
return this.modulate[1](
i,
sampleRate,
frequency,
Math.pow(base(i, sampleRate, frequency, 0), 2) +
(0.75 * base(i, sampleRate, frequency, 0.25)) +
(0.1 * base(i, sampleRate, frequency, 0.5))
);
}
},
{
name: ‘organ’,
attack: function() { return 0.3 },
dampen: function(sampleRate, frequency) { return 1+(frequency * 0.01); },
wave: function(i, sampleRate, frequency) {
var base = this.modulate[0];
return this.modulate[1](
i,
sampleRate,
frequency,
base(i, sampleRate, frequency, 0) +
0.5*base(i, sampleRate, frequency, 0.25) +
0.25*base(i, sampleRate, frequency, 0.5)
);
}
},
{
name: ‘acoustic’,
attack: function() { return 0.002; },
dampen: function() { return 1; },
wave: function(i, sampleRate, frequency) {
var vars = this.vars;
vars.valueTable = !vars.valueTable?[]:vars.valueTable;
if(typeof(vars.playVal)==’undefined’) { vars.playVal = 0; }
if(typeof(vars.periodCount)==’undefined’) { vars.periodCount = 0; }
var valueTable = vars.valueTable;
var playVal = vars.playVal;
var periodCount = vars.periodCount;
var period = sampleRate/frequency;
var p_hundredth = Math.floor((period-Math.floor(period))*100);
var resetPlay = false;
if(valueTable.length<=Math.ceil(period)) {
valueTable.push(Math.round(Math.random())*2-1);
return valueTable[valueTable.length-1];
} else {
valueTable[playVal] = (valueTable[playVal>=(valueTable.length-1)?0:playVal+1] + valueTable[playVal]) * 0.5;
if(playVal>=Math.floor(period)) {
if(playVal<Math.ceil(period)) {
if((periodCount%100)>=p_hundredth) {
// Reset
resetPlay = true;
valueTable[playVal+1] = (valueTable[0] + valueTable[playVal+1]) * 0.5;
vars.periodCount++;
}
} else {
resetPlay = true;
}
}
var _return = valueTable[playVal];
if(resetPlay) { vars.playVal = 0; } else { vars.playVal++; }
return _return;
}
}
},
{
name: ‘edm’,
attack: function() { return 0.002; },
dampen: function() { return 1; },
wave: function(i, sampleRate, frequency) {
var base = this.modulate[0];
var mod = this.modulate.slice(1);
return mod[0](
i,
sampleRate,
frequency,
mod[9](
i,
sampleRate,
frequency,
mod[2](
i,
sampleRate,
frequency,
Math.pow(base(i, sampleRate, frequency, 0), 3) +
Math.pow(base(i, sampleRate, frequency, 0.5), 5) +
Math.pow(base(i, sampleRate, frequency, 1), 7)
)
) +
mod[8](
i,
sampleRate,
frequency,
base(i, sampleRate, frequency, 1.75)
)
);
}
});
Is there an interface like using sliders or mixers etc to generate sounds?
---
**Gemini:**
Yes, we can absolutely build a "Synthesizer Mixer".
Since you have the full code, we can interact with the Synth.loadSoundProfile() function dynamically. Instead of writing code, we will map HTML Sliders to the variables inside the wave function.
Here is a complete HTML/JS Interface. Save this in the same folder as your audiosynth.js file (or paste your library code into a <script> tag).
The "Slider Synth" Interface
This tool treats the synthesizer like a mixing desk.
Harmonics: Sliders mix different sine waves (Base tone, Octave, High Frequency).
Envelope: Sliders control how "punchy" or "smooth" the sound is.
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>AudioSynth Slider Mixer</title>
<style>
:root { --bg: #222; --panel: #333; --accent: #00d2ff; --text: #eee; }
body { background: var(--bg); color: var(--text); font-family: sans-serif; padding: 20px; text-align: center; }
/* Layout */
.container { display: flex; gap: 20px; justify-content: center; max-width: 1000px; margin: 0 auto; flex-wrap: wrap; }
.panel { background: var(--panel); padding: 20px; border-radius: 10px; box-shadow: 0 4px 10px rgba(0,0,0,0.5); flex: 1; min-width: 300px; }
h2 { margin-top: 0; border-bottom: 2px solid var(--accent); padding-bottom: 10px; font-size: 18px; text-transform: uppercase; letter-spacing: 1px; }
/* Sliders */
.slider-group { margin-bottom: 20px; text-align: left; }
.slider-group label { display: flex; justify-content: space-between; font-size: 14px; margin-bottom: 5px; font-weight: bold; }
input[type=range] { width: 100%; cursor: pointer; accent-color: var(--accent); }
/* Piano Keys */
.piano { display: flex; justify-content: center; gap: 4px; margin-top: 20px; background: #111; padding: 10px; border-radius: 5px; }
.key {
width: 40px; height: 120px; background: white; border-radius: 0 0 4px 4px;
cursor: pointer; position: relative; transition: 0.1s;
display: flex; align-items: flex-end; justify-content: center; padding-bottom: 10px;
color: #333; font-weight: bold; font-size: 12px; user-select: none;
}
.key:active { background: var(--accent); transform: scale(0.95); }
.key.black {
background: #000; color: white; height: 80px; width: 30px;
margin-left: -17px; margin-right: -17px; z-index: 2;
}
/* Export Area */
textarea { width: 100%; height: 150px; background: #111; color: #0f0; border: none; padding: 10px; font-family: monospace; font-size: 12px; margin-top: 10px; }
button.export-btn { background: var(--accent); color: #000; border: none; padding: 10px 20px; font-weight: bold; cursor: pointer; margin-top: 10px; border-radius: 4px; }
button.export-btn:hover { opacity: 0.8; }
</style>
</head>
<body>
<h1>🎚️ AudioSynth Mixer</h1>
<div class="container">
<div class="panel">
<h2>Harmonics (Timbre)</h2>
<div class="slider-group">
<label>Fundamental (Base Tone) <span id="val-h1">1.0</span></label>
<input type="range" id="h1" min="0" max="1" step="0.01" value="1.0" oninput="updateUI()">
</div>
<div class="slider-group">
<label>2nd Harmonic (Octave) <span id="val-h2">0.5</span></label>
<input type="range" id="h2" min="0" max="1" step="0.01" value="0.5" oninput="updateUI()">
</div>
<div class="slider-group">
<label>3rd Harmonic (Fifth) <span id="val-h3">0.25</span></label>
<input type="range" id="h3" min="0" max="1" step="0.01" value="0.25" oninput="updateUI()">
</div>
<div class="slider-group">
<label>High Freq Sparkle <span id="val-h4">0.1</span></label>
<input type="range" id="h4" min="0" max="1" step="0.01" value="0.1" oninput="updateUI()">
</div>
</div>
<div class="panel">
<h2>Envelope (Shape)</h2>
<div class="slider-group">
<label>Attack Speed (Seconds) <span id="val-att">0.002</span></label>
<input type="range" id="att" min="0.001" max="0.5" step="0.001" value="0.002" oninput="updateUI()">
<small style="color:#888">Low = Pluck/Piano, High = Pad/Violin</small>
</div>
<div class="slider-group">
<label>Dampen (Decay) <span id="val-damp">1.0</span></label>
<input type="range" id="damp" min="0.1" max="5.0" step="0.1" value="1.0" oninput="updateUI()">
<small style="color:#888">Low = Long Sustain, High = Short Pluck</small>
</div>
<button class="export-btn" onclick="generateCode()">Generate JS Code</button>
</div>
</div>
<div class="piano">
<div class="key" onclick="playTone('C', 3)">C3</div>
<div class="key" onclick="playTone('D', 3)">D3</div>
<div class="key" onclick="playTone('E', 3)">E3</div>
<div class="key" onclick="playTone('F', 3)">F3</div>
<div class="key" onclick="playTone('G', 3)">G3</div>
<div class="key" onclick="playTone('A', 3)">A3</div>
<div class="key" onclick="playTone('B', 3)">B3</div>
<div class="key" onclick="playTone('C', 4)">C4</div>
</div>
<div class="container" style="margin-top: 20px;">
<textarea id="code-output" placeholder="Click 'Generate JS Code' to get your profile..."></textarea>
</div>
<script src="audiosynth.js"></script>
<script>
// Store current slider values
let params = {
h1: 1.0, h2: 0.5, h3: 0.25, h4: 0.1,
attack: 0.002, dampen: 1.0
};
function updateUI() {
// Update the display numbers
params.h1 = parseFloat(document.getElementById('h1').value);
params.h2 = parseFloat(document.getElementById('h2').value);
params.h3 = parseFloat(document.getElementById('h3').value);
params.h4 = parseFloat(document.getElementById('h4').value);
params.attack = parseFloat(document.getElementById('att').value);
params.dampen = parseFloat(document.getElementById('damp').value);
document.getElementById('val-h1').innerText = params.h1;
document.getElementById('val-h2').innerText = params.h2;
document.getElementById('val-h3').innerText = params.h3;
document.getElementById('val-h4').innerText = params.h4;
document.getElementById('val-att').innerText = params.attack;
document.getElementById('val-damp').innerText = params.dampen;
}
function playTone(note, octave) {
// TRICK: AudioSynth caches sounds aggressively.
// If we want to hear our slider changes instantly,
// we must create a UNIQUE instrument name every time we press a key.
// Otherwise, it will play the old cached sound.
let tempName = "mix_" + Date.now();
Synth.loadSoundProfile({
name: tempName,
attack: function() { return params.attack; },
dampen: function(sampleRate, frequency, volume) {
// Using a simplified dampen logic based on the slider
return Math.pow(0.5*Math.log((frequency*volume)/sampleRate), 2) * params.dampen;
},
wave: function(i, sampleRate, frequency, volume) {
// We access the built-in modulators (Sin waves)
// modulate[0] = Fundamental
// modulate[1] = Octave (2nd harmonic)
// modulate[2] = 2 Octaves up (3rd harmonic)
var base = this.modulate[0];
var mod1 = this.modulate[1];
var mod2 = this.modulate[2];
// We mix them based on slider values!
return (
(params.h1 * base(i, sampleRate, frequency, 0)) +
(params.h2 * mod1(i, sampleRate, frequency, 0)) +
(params.h3 * mod2(i, sampleRate, frequency, 0)) +
(params.h4 * base(i, sampleRate, frequency, 0.5)) // Phase shifted sparkle
);
}
});
// Create and play instantly
let instrument = Synth.createInstrument(tempName);
instrument.play(note, octave, 2);
}
function generateCode() {
// Generates the code snippet to copy-paste into your project
let code = `
Synth.loadSoundProfile({
name: 'custom_slider_sound',
attack: function() { return ${params.attack}; },
dampen: function(sampleRate, frequency, volume) {
return Math.pow(0.5*Math.log((frequency*volume)/sampleRate), 2) * ${params.dampen};
},
wave: function(i, sampleRate, frequency, volume) {
var base = this.modulate[0];
var mod1 = this.modulate[1];
var mod2 = this.modulate[2];
return (
(${params.h1} * base(i, sampleRate, frequency, 0)) +
(${params.h2} * mod1(i, sampleRate, frequency, 0)) +
(${params.h3} * mod2(i, sampleRate, frequency, 0)) +
(${params.h4} * base(i, sampleRate, frequency, 0.5))
);
}
});
`;
document.getElementById('code-output').value = code.trim();
}
</script>
</body>
</html>
How to use this:
Fundamental: This is the main note.
2nd / 3rd Harmonic: Turning these up makes the sound "brighter" or more like an organ.
Attack Speed:
0.002: Piano/Pluck sound.
0.1+: Violin/Pad sound (fades in).
Dampen: Controls how fast the sound dies.
Generate JS Code: Once you like a sound, click this button. It will generate the exact Synth.loadSoundProfile code block for you to copy and paste into your final application.
---
**User:**
You said
Back to the simple piano:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple JS Piano</title>
<style>
body { font-family: sans-serif; text-align: center; background: darkblue; color: white; padding-top: 50px; }
.piano { display: flex; justify-content: center; gap: 5px;}
.key {
width: 60px; height: 200px; background: white; border: 2px solid black; border-radius: 0 0 5px 5px;
cursor: pointer; color: black; display: flex; align-items: flex-end;
justify-content: center; padding-bottom: 20px; font-weight: bold;
transition: background 0.1s; user-select: none;
}
.key:active { background: #ddd; transform: scale(0.98); }
.controls { margin-bottom: 20px; }
button { padding: 10px 20px; cursor: pointer; font-size: 16px; }
</style>
</head>
<body>
<h1>JavaScript AudioSynth</h1>
<div class="controls">
<label>Instrument: </label>
<select id="instrument-select">
<option value="piano">Piano</option>
<option value="organ">Organ</option>
<option value="acoustic">Acoustic Guitar</option>
<option value="edm">EDM</option>
</select>
</div>
<div class="piano">
<div class="key" onclick="playNote('C', 4)">C</div>
<div class="key" onclick="playNote('D', 4)">D</div>
<div class="key" onclick="playNote('E', 4)">E</div>
<div class="key" onclick="playNote('F', 4)">F</div>
<div class="key" onclick="playNote('G', 4)">G</div>
<div class="key" onclick="playNote('A', 4)">A</div>
<div class="key" onclick="playNote('B', 4)">B</div>
</div>
<script src="../audiosynth.js"></script>
<script>
// 1. Create the AudioSynth Instance
// AudioSynth is a singleton in this library, accessed via 'Synth'
function playNote(note, octave) {
// Get selected instrument ID from the dropdown
const instrumentId = document.getElementById('instrument-select').value;
// Create the instrument (0=Piano, 1=Organ, 2=Acoustic, 3=EDM)
const instrument = Synth.createInstrument(instrumentId);
// Play the note: Note Name, Octave, Duration (seconds)
instrument.play(note, octave, 2);
}
</script>
</body>
</html>
Is it better to put div class key into javascript arrays or objects? Then can you generate complete piano keys?
Gemini: Yes, it is much better to use JavaScript to generate the keys.
Why?
Scalability: You can easily change the range (e.g., make it 88 keys or 2 octaves) by changing one number loop instead of copying 88 lines of HTML.
Maintenance: If you want to change the CSS class or click behavior, you only edit it in one place.
Black Keys: A “complete” piano has black keys (sharps/flats). Handling the layout of black keys manually in HTML is very messy. JavaScript makes it organized.
Here is the complete solution. It uses a JavaScript array to define the music scale and loops to generate a full keyboard (White + Black keys) dynamically.
Updated index.html
I have added the CSS logic to handle Black Keys correctly (using negative margins to make them sit “between” the white keys).
HTML <!DOCTYPE html>
Generated JS Piano
Key Changes Explained
The notes Array: Instead of typing divs, I defined the musical pattern (C, C#, D, D#…) in an array. This handles the tricky logic of where black keys exist (e.g., there is no black key between E and F).
The generatePiano Loop: You can now change generatePiano(3, 4) to generatePiano(2, 6) and it will instantly build a massive 5-octave piano without writing any extra HTML.
CSS Trick (margin-left: -14px): This is how we position black keys without complex Absolute Positioning coordinates.
Flexbox lays out items: [White] [Black] [White]
We give the Black key a negative margin. This pulls the White keys on the left and right closer to it, causing the Black key to visually overlap them, just like a real piano.
User: You said
It works well now. Moving on next, how would you recommend on inputting auto playing piano like playing canon in d? I prefer the music and melody to be on separate file and I can input more maybe in form of object?
Gemini: This is a great feature to add. To make the piano “auto-play,” we need to turn sheet music into a language JavaScript can understand.
The best way to do this is to create a Sequencer. We will define the song as an Array of Objects (your “sheet music”) in a separate file, and then write a function to read that file and schedule the notes.
Here is the best architecture for this:
songs.js: A separate file containing the note data.
The Player Logic: A function that loops through that data and uses setTimeout to trigger the keys at the right millisecond.
Step 1: Create songs.js
Create a new file named songs.js. We will use a simple format:
note: The key (e.g., ‘D’, ‘F#’).
octave: The pitch level (3, 4, 5).
time: When the note should play (in seconds from the start).
Here is a recognizable segment of Canon in D (Bass line + Melody combined):
JavaScript // songs.js
const songs = { canon_in_d: [ // — BAR 1 (D Major) — // Bass { note: ‘D’, octave: 3, time: 0.0 }, // Melody { note: ‘F#’, octave: 4, time: 0.0 }, { note: ‘E’, octave: 4, time: 0.5 }, { note: ‘D’, octave: 4, time: 1.0 }, { note: ‘C#’, octave: 4, time: 1.5 },
// --- BAR 2 (A Major) ---
// Bass
{ note: 'A', octave: 2, time: 2.0 },
// Melody
{ note: 'B', octave: 3, time: 2.0 },
{ note: 'A', octave: 3, time: 2.5 },
{ note: 'B', octave: 3, time: 3.0 },
{ note: 'C#', octave: 4, time: 3.5 },
// --- BAR 3 (B Minor) ---
// Bass
{ note: 'B', octave: 2, time: 4.0 },
// Melody
{ note: 'D', octave: 4, time: 4.0 },
{ note: 'C#', octave: 4, time: 4.5 },
{ note: 'B', octave: 3, time: 5.0 },
{ note: 'A', octave: 3, time: 5.5 },
// --- BAR 4 (F# Minor) ---
// Bass
{ note: 'F#', octave: 2, time: 6.0 },
// Melody
{ note: 'A', octave: 3, time: 6.0 },
{ note: 'G', octave: 3, time: 6.5 },
{ note: 'F#', octave: 3, time: 7.0 },
{ note: 'E', octave: 3, time: 7.5 },
// --- Ending on G ---
{ note: 'G', octave: 2, time: 8.0 },
{ note: 'G', octave: 3, time: 8.0 }
] };
Step 2: Update index.html
We need to add a “Play Song” button and the logic to read that file.
Add this new script block after your existing scripts. This code does two smart things:
Schedules the audio: It calculates exactly when to trigger the sound.
Visual Feedback: It looks for the specific HTML key (e.g., “D3”) and lights it up while the AI plays it.
HTML
Step 3: Critical Fix for the Generator (ID Matching)
For highlightKey to work reliably (especially for blank black keys), we should give every key a unique ID when we generate it.
Go back to your generatePiano function in the previous code and add this line:
JavaScript // Inside the notes.forEach loop:
const key = document.createElement(‘div’);
key.className = key ${note.type};
// ADD THIS LINE: Give the key a unique ID like “key-C-3” or “key-F#-4”
key.id = key-${note.name}-${oct};
// … rest of code
Now, update the highlightKey function to be instant and simple:
JavaScript
function highlightKey(note, octave) {
// Construct the ID we are looking for
const id = key-${note}-${octave};
const keyElement = document.getElementById(id);
if (keyElement) {
animateKey(keyElement);
} }
Summary of How to Input More Songs
With this setup, “inputting” a song is just typing data into songs.js. You don’t need to touch the HTML.
If you want to add “Twinkle Twinkle Little Star”, you just open songs.js and add:
JavaScript twinkle: [ { note: ‘C’, octave: 4, time: 0.0 }, { note: ‘C’, octave: 4, time: 0.5 }, { note: ‘G’, octave: 4, time: 1.0 }, { note: ‘G’, octave: 4, time: 1.5 }, { note: ‘A’, octave: 4, time: 2.0 }, { note: ‘A’, octave: 4, time: 2.5 }, { note: ‘G’, octave: 4, time: 3.0 } ]
Then add a button .
User: You said
It works, just purely for:
canon_in_d: [
// --- BAR 1 (D Major) ---
// Bass
{ note: 'D', octave: 3, time: 0.0 },
// Melody
{ note: 'F#', octave: 4, time: 0.0 },
{ note: 'E', octave: 4, time: 0.5 },
{ note: 'D', octave: 4, time: 1.0 },
{ note: 'C#', octave: 4, time: 1.5 },
// --- BAR 2 (A Major) ---
// Bass
{ note: 'A', octave: 2, time: 2.0 },
// Melody
{ note: 'B', octave: 3, time: 2.0 },
{ note: 'A', octave: 3, time: 2.5 },
{ note: 'B', octave: 3, time: 3.0 },
{ note: 'C#', octave: 4, time: 3.5 },
// --- BAR 3 (B Minor) ---
// Bass
{ note: 'B', octave: 2, time: 4.0 },
// Melody
{ note: 'D', octave: 4, time: 4.0 },
{ note: 'C#', octave: 4, time: 4.5 },
{ note: 'B', octave: 3, time: 5.0 },
{ note: 'A', octave: 3, time: 5.5 },
// --- BAR 4 (F# Minor) ---
// Bass
{ note: 'F#', octave: 2, time: 6.0 },
// Melody
{ note: 'A', octave: 3, time: 6.0 },
{ note: 'G', octave: 3, time: 6.5 },
{ note: 'F#', octave: 3, time: 7.0 },
{ note: 'E', octave: 3, time: 7.5 },
// --- Ending on G ---
{ note: 'G', octave: 2, time: 8.0 },
{ note: 'G', octave: 3, time: 8.0 }
]
Can you research and find the complete and accurate music?
Gemini: Here is the complete, recognizable 8-bar loop of Pachelbel’s Canon in D, extended to finish the cycle that your snippet started.
This version completes the famous chord progression (D - A - Bm - F#m - G - D - G - A) and adds a proper resolution chord at the end.
Replace your canon_in_d array in songs.js with this:
JavaScript canon_in_d: [ // — BAR 1 (D Major) — // Bass { note: ‘D’, octave: 3, time: 0.0 }, // Melody (Descending Stepwise) { note: ‘F#’, octave: 4, time: 0.0 }, { note: ‘E’, octave: 4, time: 0.5 }, { note: ‘D’, octave: 4, time: 1.0 }, { note: ‘C#’, octave: 4, time: 1.5 },
// --- BAR 2 (A Major) ---
// Bass
{ note: 'A', octave: 2, time: 2.0 },
// Melody (Ascending Stepwise)
{ note: 'B', octave: 3, time: 2.0 },
{ note: 'A', octave: 3, time: 2.5 },
{ note: 'B', octave: 3, time: 3.0 },
{ note: 'C#', octave: 4, time: 3.5 },
// --- BAR 3 (B Minor) ---
// Bass
{ note: 'B', octave: 2, time: 4.0 },
// Melody (Descending)
{ note: 'D', octave: 4, time: 4.0 },
{ note: 'C#', octave: 4, time: 4.5 },
{ note: 'B', octave: 3, time: 5.0 },
{ note: 'A', octave: 3, time: 5.5 },
// --- BAR 4 (F# Minor) ---
// Bass
{ note: 'F#', octave: 2, time: 6.0 },
// Melody (Descending)
{ note: 'A', octave: 3, time: 6.0 },
{ note: 'G', octave: 3, time: 6.5 },
{ note: 'F#', octave: 3, time: 7.0 },
{ note: 'E', octave: 3, time: 7.5 },
// --- BAR 5 (G Major) ---
// Bass
{ note: 'G', octave: 2, time: 8.0 },
// Melody (The pattern repeats: High note stepping down)
{ note: 'D', octave: 4, time: 8.0 },
{ note: 'C#', octave: 4, time: 8.5 },
{ note: 'B', octave: 3, time: 9.0 },
{ note: 'A', octave: 3, time: 9.5 },
// --- BAR 6 (D Major) ---
// Bass
{ note: 'D', octave: 3, time: 10.0 }, // Can also use D2
// Melody
{ note: 'G', octave: 3, time: 10.0 },
{ note: 'F#', octave: 3, time: 10.5 },
{ note: 'E', octave: 3, time: 11.0 },
{ note: 'D', octave: 3, time: 11.5 },
// --- BAR 7 (G Major / Em) ---
// Bass
{ note: 'G', octave: 2, time: 12.0 },
// Melody (Climbing back up for the finale)
{ note: 'B', octave: 3, time: 12.0 },
{ note: 'A', octave: 3, time: 12.5 },
{ note: 'B', octave: 3, time: 13.0 },
{ note: 'C#', octave: 4, time: 13.5 },
// --- BAR 8 (A Major) ---
// Bass
{ note: 'A', octave: 2, time: 14.0 },
// Melody (Resolution tension)
{ note: 'D', octave: 4, time: 14.0 },
{ note: 'C#', octave: 4, time: 14.5 },
{ note: 'B', octave: 3, time: 15.0 },
{ note: 'C#', octave: 4, time: 15.5 },
// --- FINALE (D Major) ---
// Resolve home
{ note: 'D', octave: 2, time: 16.0 }, // Low Bass D
{ note: 'D', octave: 3, time: 16.0 }, // Mid D
{ note: 'F#', octave: 4, time: 16.0 } // Melody Home ]
User: You said
I have uploaded the music sheet, can you generate based on this? Inform me if you cannot generate them all.
Gemini: I have analyzed the uploaded sheet music (“Canon in D” arranged by Jacob Danao).
Note on Completeness: Generating the entire 3-page score (approx. 50 measures with complex 16th notes) is too large for a single text response and would be difficult to maintain in a single Javascript file.
However, I have accurately transcribed the Intro (Measures 1–2) and the Main Theme (Measures 3–6). This specific arrangement uses a beautiful left-hand arpeggio pattern (broken chords) rather than the simple block chords you used previously.
Here is the accurate transcription for the first 6 bars.
Updated songs.js
I have set the tempo to match the “Graceful” (J=70) marking in your sheet music.
JavaScript // A “Beat” unit to make timing easier to read. // 70 BPM means 1 beat = 0.85 seconds. // The arpeggios are 8th notes (0.5 beats). const B = 0.85;
const songs = { canon_in_d: [ // ============================ // MEASURE 1 (Intro) // Left Hand Arpeggio: D - A - Bm - F#m context // ============================ { note: ‘D’, octave: 3, time: 0.0 }, // 1 { note: ‘A’, octave: 2, time: 0.5 * B }, // & { note: ‘D’, octave: 3, time: 1.0 * B }, // 2 { note: ‘F#’, octave: 3, time: 1.5 * B }, // &
{ note: 'A', octave: 2, time: 2.0 * B }, // 3
{ note: 'E', octave: 3, time: 2.5 * B }, // &
{ note: 'A', octave: 3, time: 3.0 * B }, // 4
{ note: 'C#', octave: 4, time: 3.5 * B }, // &
// ============================
// MEASURE 2
// Left Hand: Bm - F#m context
// ============================
{ note: 'B', octave: 2, time: 4.0 * B },
{ note: 'F#', octave: 3, time: 4.5 * B },
{ note: 'B', octave: 3, time: 5.0 * B },
{ note: 'D', octave: 4, time: 5.5 * B },
{ note: 'F#', octave: 2, time: 6.0 * B },
{ note: 'C#', octave: 3, time: 6.5 * B },
{ note: 'F#', octave: 3, time: 7.0 * B },
{ note: 'A', octave: 3, time: 7.5 * B },
// ============================
// MEASURE 3 (Melody Enters)
// Right Hand: F#5... | Left Hand: G Major context
// ============================
// RH Melody
{ note: 'F#', octave: 5, time: 8.0 * B }, // Main melody start
{ note: 'E', octave: 5, time: 9.0 * B },
{ note: 'D', octave: 5, time: 10.0 * B },
{ note: 'C#', octave: 5, time: 11.0 * B },
// LH Arpeggio (G Major)
{ note: 'G', octave: 2, time: 8.0 * B },
{ note: 'D', octave: 3, time: 8.5 * B },
{ note: 'G', octave: 3, time: 9.0 * B },
{ note: 'B', octave: 3, time: 9.5 * B },
// LH Arpeggio (D Major)
{ note: 'D', octave: 3, time: 10.0 * B },
{ note: 'A', octave: 3, time: 10.5 * B },
{ note: 'D', octave: 4, time: 11.0 * B },
{ note: 'F#', octave: 4, time: 11.5 * B },
// ============================
// MEASURE 4
// Right Hand: B... | Left Hand: G - A context
// ============================
// RH Melody
{ note: 'B', octave: 4, time: 12.0 * B },
{ note: 'A', octave: 4, time: 13.0 * B },
{ note: 'B', octave: 4, time: 14.0 * B },
{ note: 'C#', octave: 5, time: 15.0 * B },
// LH Arpeggio (G Major)
{ note: 'G', octave: 2, time: 12.0 * B },
{ note: 'D', octave: 3, time: 12.5 * B },
{ note: 'G', octave: 3, time: 13.0 * B },
{ note: 'B', octave: 3, time: 13.5 * B },
// LH Arpeggio (A Major)
{ note: 'A', octave: 2, time: 14.0 * B },
{ note: 'E', octave: 3, time: 14.5 * B },
{ note: 'A', octave: 3, time: 15.0 * B },
{ note: 'C#', octave: 4, time: 15.5 * B },
// ============================
// MEASURE 5
// Variation starts (Melody repeats but Bass continues pattern)
// ============================
// RH Melody
{ note: 'D', octave: 5, time: 16.0 * B },
{ note: 'C#', octave: 5, time: 17.0 * B },
{ note: 'B', octave: 4, time: 18.0 * B },
{ note: 'A', octave: 4, time: 19.0 * B },
// LH Arpeggio (Repeats M1 pattern)
{ note: 'D', octave: 3, time: 16.0 * B },
{ note: 'A', octave: 2, time: 16.5 * B },
{ note: 'D', octave: 3, time: 17.0 * B },
{ note: 'F#', octave: 3, time: 17.5 * B },
{ note: 'A', octave: 2, time: 18.0 * B },
{ note: 'E', octave: 3, time: 18.5 * B },
{ note: 'A', octave: 3, time: 19.0 * B },
{ note: 'C#', octave: 4, time: 19.5 * B },
// ============================
// MEASURE 6
// ============================
// RH Melody
{ note: 'G', octave: 4, time: 20.0 * B },
{ note: 'F#', octave: 4, time: 21.0 * B },
{ note: 'G', octave: 4, time: 22.0 * B }, // Sometimes E in variations, sheet says G
{ note: 'E', octave: 4, time: 23.0 * B },
// LH Arpeggio (Repeats M2 pattern)
{ note: 'B', octave: 2, time: 20.0 * B },
{ note: 'F#', octave: 3, time: 20.5 * B },
{ note: 'B', octave: 3, time: 21.0 * B },
{ note: 'D', octave: 4, time: 21.5 * B },
{ note: 'F#', octave: 2, time: 22.0 * B },
{ note: 'C#', octave: 3, time: 22.5 * B },
{ note: 'F#', octave: 3, time: 23.0 * B },
{ note: 'A', octave: 3, time: 23.5 * B },
// Resolving Chord (Optional End for Demo)
{ note: 'D', octave: 4, time: 24.0 * B },
{ note: 'D', octave: 3, time: 24.0 * B }
] };
How to use this
Replace the content of your songs.js with the code above.
Adjusting Speed: If you find 70 BPM too slow, simply change const B = 0.85; to a lower number (e.g., 0.6 for faster).
Note on Measures 7+: In the PDF, starting at Measure 7 (and especially Measure 21), the rhythm becomes much faster (16th notes). If you want to transcribe those later, you would use time: X.25 * B and time: X.75 * B to get the notes in between the 8th notes.
User: You said
Okay. Then we will generate another music other than canon next. What is the most beautiful and complete music that you know that you can generate in one conversation?
Gemini: The most beautiful, complete, and technically feasible piece to generate in a single conversation is “Gymnopédie No. 1” by Erik Satie.
Why this piece?
Beauty: It is universally recognized as one of the most calming, atmospheric piano pieces ever written.
Completeness: It is short enough (about 3 minutes) that we can code the entire main A-section and B-section structure here without running out of space.
Feasibility: Unlike Canon in D (which gets very fast/complex), Gymnopédie is slow and relies on long, sustained chords. This works perfectly for web audio synthesis, which excels at clear, singular tones rather than rapid-fire chaotic notes.
Here is the full transcription of the main themes of Gymnopédie No. 1.
songs.js
Replace your current file with this. I have carefully timed the famous “Low Bass -> Chord” waltz rhythm (3/4 time signature).
JavaScript // TEMPO: Lent et douloureux (Slow and sorrowful) // 1 Beat = approx 0.8 seconds. // 3/4 Time Signature (3 beats per measure) const B = 0.8;
const songs = { gymnopedie_1: [ // ============================ // INTRO (Measures 1-4) // The famous alternating Gmaj7 and Dmaj7 chords // ============================
// Measure 1 (G Major 7)
{ note: 'G', octave: 2, time: 0.0 * B }, // Beat 1: Low G
{ note: 'B', octave: 3, time: 1.0 * B }, // Beat 2: Chord
{ note: 'D', octave: 4, time: 1.0 * B },
{ note: 'F#', octave: 4, time: 1.0 * B },
// Beat 3 is silence/sustain in LH
// Measure 2 (D Major 7)
{ note: 'D', octave: 2, time: 3.0 * B }, // Beat 1: Low D
{ note: 'A', octave: 3, time: 4.0 * B }, // Beat 2: Chord
{ note: 'C#', octave: 4, time: 4.0 * B },
{ note: 'F#', octave: 4, time: 4.0 * B },
// Measure 3 (Repeat G)
{ note: 'G', octave: 2, time: 6.0 * B },
{ note: 'B', octave: 3, time: 7.0 * B },
{ note: 'D', octave: 4, time: 7.0 * B },
{ note: 'F#', octave: 4, time: 7.0 * B },
// Measure 4 (Repeat D)
{ note: 'D', octave: 2, time: 9.0 * B },
{ note: 'A', octave: 3, time: 10.0 * B },
{ note: 'C#', octave: 4, time: 10.0 * B },
{ note: 'F#', octave: 4, time: 10.0 * B },
// ============================
// THEME A (Measures 5-12)
// Melody enters: F# - A - G - F# - C# - B - C# - D
// ============================
// Measure 5 (Melody: F#)
{ note: 'F#', octave: 5, time: 12.0 * B }, // Melody
{ note: 'G', octave: 2, time: 12.0 * B }, // Bass
{ note: 'B', octave: 3, time: 13.0 * B }, // Chord
{ note: 'D', octave: 4, time: 13.0 * B },
{ note: 'F#', octave: 4, time: 13.0 * B },
// Measure 6 (Melody: A)
{ note: 'A', octave: 5, time: 15.0 * B }, // Melody
{ note: 'D', octave: 2, time: 15.0 * B }, // Bass
{ note: 'A', octave: 3, time: 16.0 * B }, // Chord
{ note: 'C#', octave: 4, time: 16.0 * B },
{ note: 'F#', octave: 4, time: 16.0 * B },
// Measure 7 (Melody: G)
{ note: 'G', octave: 5, time: 18.0 * B },
{ note: 'G', octave: 2, time: 18.0 * B },
{ note: 'B', octave: 3, time: 19.0 * B },
{ note: 'D', octave: 4, time: 19.0 * B },
{ note: 'F#', octave: 4, time: 19.0 * B },
// Measure 8 (Melody: F#)
{ note: 'F#', octave: 5, time: 21.0 * B },
{ note: 'D', octave: 2, time: 21.0 * B },
{ note: 'A', octave: 3, time: 22.0 * B },
{ note: 'C#', octave: 4, time: 22.0 * B },
{ note: 'F#', octave: 4, time: 22.0 * B },
// Measure 9 (Melody: C#)
{ note: 'C#', octave: 5, time: 24.0 * B },
{ note: 'E', octave: 2, time: 24.0 * B }, // Bass changes to E minor
{ note: 'G', octave: 3, time: 25.0 * B }, // Chord
{ note: 'B', octave: 3, time: 25.0 * B },
{ note: 'E', octave: 4, time: 25.0 * B },
// Measure 10 (Melody: B)
{ note: 'B', octave: 4, time: 27.0 * B },
{ note: 'B', octave: 2, time: 27.0 * B }, // Bass B
{ note: 'F#', octave: 3, time: 28.0 * B }, // Chord
{ note: 'A', octave: 3, time: 28.0 * B },
{ note: 'D', octave: 4, time: 28.0 * B }, // Bm7
// Measure 11 (Melody: C#)
{ note: 'C#', octave: 5, time: 30.0 * B },
{ note: 'D', octave: 2, time: 30.0 * B },
{ note: 'F#', octave: 3, time: 31.0 * B },
{ note: 'A', octave: 3, time: 31.0 * B },
{ note: 'D', octave: 4, time: 31.0 * B }, // Dmaj7
// Measure 12 (Melody: D)
{ note: 'D', octave: 5, time: 33.0 * B },
{ note: 'A', octave: 2, time: 33.0 * B }, // Bass A
{ note: 'E', octave: 3, time: 34.0 * B }, // Chord
{ note: 'A', octave: 3, time: 34.0 * B },
{ note: 'C#', octave: 4, time: 34.0 * B }, // A Maj
// ============================
// THEME B (Rise to Climax)
// ============================
// Measure 13 (High A) - The "Peak"
{ note: 'A', octave: 5, time: 36.0 * B },
{ note: 'D', octave: 2, time: 36.0 * B },
{ note: 'A', octave: 3, time: 37.0 * B },
{ note: 'D', octave: 4, time: 37.0 * B },
{ note: 'F#', octave: 4, time: 37.0 * B },
// Measure 14 (Walking down: G - F#)
{ note: 'G', octave: 5, time: 39.0 * B }, // Beat 1
{ note: 'F#', octave: 5, time: 40.0 * B }, // Beat 2 (on chord)
{ note: 'D', octave: 2, time: 39.0 * B }, // Bass
{ note: 'A', octave: 3, time: 40.0 * B }, // Chord
{ note: 'C#', octave: 4, time: 40.0 * B },
{ note: 'F#', octave: 4, time: 40.0 * B },
// Measure 15 (E - D - B)
{ note: 'E', octave: 5, time: 42.0 * B },
{ note: 'D', octave: 5, time: 43.0 * B }, // Beat 2
{ note: 'B', octave: 4, time: 44.0 * B }, // Beat 3
{ note: 'E', octave: 2, time: 42.0 * B }, // Bass
{ note: 'B', octave: 3, time: 43.0 * B }, // Chord
{ note: 'E', octave: 4, time: 43.0 * B },
{ note: 'G', octave: 4, time: 43.0 * B },
// Measure 16 (D - C# - D)
{ note: 'D', octave: 5, time: 45.0 * B },
{ note: 'C#', octave: 5, time: 46.0 * B },
{ note: 'D', octave: 5, time: 47.0 * B },
{ note: 'B', octave: 2, time: 45.0 * B },
{ note: 'F#', octave: 3, time: 46.0 * B },
{ note: 'B', octave: 3, time: 46.0 * B },
{ note: 'D', octave: 4, time: 46.0 * B },
// ============================
// OUTRO (Resolution)
// ============================
// Measure 17 (Low G Maj 7)
{ note: 'E', octave: 5, time: 48.0 * B }, // Melody ends on E
{ note: 'G', octave: 2, time: 48.0 * B },
{ note: 'B', octave: 3, time: 49.0 * B },
{ note: 'D', octave: 4, time: 49.0 * B },
{ note: 'F#', octave: 4, time: 49.0 * B },
// Final Chord (D Maj 7)
{ note: 'F#', octave: 4, time: 51.0 * B }, // Resolve to F#
{ note: 'D', octave: 2, time: 51.0 * B },
{ note: 'A', octave: 3, time: 52.0 * B },
{ note: 'C#', octave: 4, time: 52.0 * B },
{ note: 'F#', octave: 4, time: 52.0 * B }
] };
3 Tips for Best Listening
Instrument: In your dropdown, select “Piano” (ID 0) or “Acoustic” (ID 2). Satie sounds terrible on “EDM”.
Slider Settings (If using your mixer):
Attack: Increase slightly to 0.05 (makes it softer, less “plucky”).
Dampen: Decrease to 0.8 (makes the notes ring out longer, acting like a Sustain Pedal).
Visuals: Watch the left hand (Bass) jump. Satie is famous for the “Gymnopedie Jump”—the left hand hits a low bass note, then jumps up to hit a chord in the middle. Your visualizer should show this clearly.