Audio Context

Create procedural audio.

Authors and contributors to this experimental extension: aliustaoglu.

Warning

This is an extension made by a community member and it only got through a light review by the GDevelop extension team. As such, we can't guarantee it meets all the quality standards of fully reviewed extensions.

This extension enables you to create your own sounds in real time without using any wav, mp3 or ogg files. It procedurally creates sounds using the Web Audio API and AudioContext.

The Web Audio API provides a powerful and versatile system for controlling audio on the Web, allowing developers to choose audio sources, add effects to audio, create audio visualizations, apply spatial effects (such as panning) and much more.

This extension can easily create chiptunes.

Actions

Add detune to a synth
Add detune on top of the main frequency to get cool synth effects.

See parameters

Parameter 1 (string): Synth name
Parameter 2 (🔢 Number): Detune value in chips

Technical note: parameters 0, 3 are internal parameters handled by GDevelop.

Add multiple detunes to a synth
Add comma separated detune values to a synth.

See parameters

Parameter 1 (string): Synth name
Parameter 2 (string): Comma separated detune values

Technical note: parameters 0, 3 are internal parameters handled by GDevelop.

Add/update filter
Add or update biquad filter.

See parameters

Parameter 1 (string): Synth name
Parameter 2 (🔤 String): Filter type (one of: "lowpass", "highpass", "bandpass", "lowshelf", "highshelf", "peaking", "notch", "allpass")
Parameter 3 (🔢 Number): Frequency [0-20,000]
Parameter 4 (🔢 Number): Quality factor [0-100]
Parameter 5 (🔢 Number): Gain value

Technical note: parameters 0, 6 are internal parameters handled by GDevelop.

Create chord
Create a new chord.

See parameters

Parameter 1 (string): Chord name (imaginary or real)
Parameter 2 (string): Comma separated notes including octave eg. "C#4, Eb4, G4"

Technical note: parameters 0, 3 are internal parameters handled by GDevelop.

Create an Audio Context
Create a new audio context (In most cases you only need one context and reuse it with the name).

See parameters

Parameter 1 (string): Context name

Technical note: parameters 0, 2 are internal parameters handled by GDevelop.

Create/update synth
Create or update synth with attack, decay, sustain, release gain and apply filters.

See parameters

Parameter 1 (string): Name of the synth
Parameter 2 (string): Context name
Parameter 3 (🔤 String): Wave type (one of: "sine", "square", "triangle", "sawtooth")
Parameter 4 (🔢 Number): Attack value
Parameter 5 (🔢 Number): Decay value
Parameter 6 (🔢 Number): Sustain value
Parameter 7 (🔢 Number): Release value

Technical note: parameters 0, 8 are internal parameters handled by GDevelop.

Play chord
Play an existing chord on a synth.

See parameters

Parameter 1 (string): Chord name
Parameter 2 (string): Synth name to play the chord on
Parameter 3 (🔢 Number): Duration

Technical note: parameters 0, 4 are internal parameters handled by GDevelop.

Play note
Play a note a synth you've created before.

See parameters

Parameter 1 (string): Synth name
Parameter 2 (🔤 String): Note name (one of: "C", "C#", "Db", "D", "D#", "Eb", "E", "F", "F#", "Gb", "G", "G#", "Ab", "A", "A#", "Bb", "B")
Parameter 3 (🔢 Number): Octave (0-8)
Parameter 4 (🔢 Number): Note duration (-1 to play until stopped manually)

Technical note: parameters 0, 5 are internal parameters handled by GDevelop.

Conditions

Context exists
Check if the context already created.

See parameters

Parameter 1 (string): Context name

Technical note: parameters 0, 2 are internal parameters handled by GDevelop.

Expressions

Expression	Description
`AudioContext::ChordNameByIndex(number)`	Get chord name by index.
	🔢 Number	Chord index
`AudioContext::NumberOfChords()`	Number of chords (For looping).

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