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Fast, JavaScript DSP library that creates JIT optimized audio callbacks using code generation techniques
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Gibberish is designed to be a fast audio API for the browser. It takes the low-level building blocks provided by genish.js and uses them to create higher-level synthesizers, effects, and sequencers. Gibberish proceses each sample of each synthesis block one sample at a time, enabling a variety of effects not typically possible in browser-based synthesis systems, most importantly single-sample feedback loops and audio-rate modulation of scheduling.

Note that this branch is for version 3 of the library. See the master branch for the pre-June 2017 version that is currently used in Gibber. There is also a tagged release of the older version (2.0.0).

Live Code Playground

Example Code

kik = Kick().connect() // connects to master output by default

// sequence calls to 'trigger' method of kick drum every 1/2 second
// with alternating loudness levels.
seq  = Sequencer.make( [.25,.5], [22050], kik, 'trigger' ] ).start()

chr = Chorus().connect()
syn = PolySynth({ maxVoices:4, attack:44, decay:22050, gain:.1 })

// connect to chorus and master output
syn.connect( chr ).connect()

syn.chord( [220,330,440,550] )

HTML + Initialization

<!doctype html >

<html lang='en'>
    <script src='dist/gibberish.js'></script>

  window.onload = function() {
    // access objects in Gibberish namespace
    Gibberish.oscillators.Sine({ frequency:220 }).connect()
    // or export namespace to object of your choice 
    Gibberish.export( window )
    Sine({ frequency:220 }).connect()

Development dependencies

  • node 6 or better
  • npm
  • gulp


You need to have node.js and gulp installed. Then:

  1. Run npm install in the top level directory
  2. Run gulp in the top level directory

If you don't have gulp installed:

  1. Run npm install in the top level directory
  2. Run npm install gulp-cli in the top level directory
  3. Run ./node_modules/.bin/gulp in the top level directory, or simply gulp if you have gulp installed globally.

This will create both a minimized and an un-minimized version of the library.


Gibberish includes a long list of oscillators, fx, and synthesis algorithms.


  • Sine
  • Triangle
  • Saw (wavetable & anti-aliased)
  • PWM (algorithmic & anti-aliased)
  • Square (wavetable & anti-aliased)
  • Noise( white, pink, brown )
  • Sampler - read audiofiles and playback at various speeds

Synthetic Percussion (TR-808 emulation)

  • Kick
  • Snare
  • Clave
  • Tom
  • Cowbell
  • Hat
  • Conga


All synths also have polyphonic versions.

  • Synth - oscillator + optional filter + envelope
  • Monosynth - three oscillators + optional filter + envelope
  • FM - two op FM synthesis + optional filter + envelope
  • Karplus-Strong - Physical model of a plucked string


  • BitCrusher - bit depth and sample rate reduction
  • Buffer Shuffler
  • Chorus (arp solina model)
  • Delay
  • Distortion
  • Flanger
  • Ring Modulation
  • Reverb (freeverb and dattorro plate reverb models)
  • Vibrato


  • State Variable Filter (12 db resonant)
  • Biquad Filter (12 db resonant)
  • Ladder Filter ("Moog-style" 24db resonant)
  • "Virtual Analog" (aka implicit) Ladder Filter ("Moog-style" 24db resonant)
  • "Virtual Analog" (aka implicit) ZDF filter (a la TB-303)


  • Envelope Follower


  • Seq - sample-accurate scheduling
  • Seq2 - affords audio-rate modulation of timing


Gibberish is licensed under the MIT license.

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