webaudio-instruments

This is a simple wrapper for a subset of the functionality in webaudio-tinysynth. It lets you play tones from MIDI-like instruments, but without any sound fonts or audio files - the tones are generated purely from WebAudio oscillators.

Live demo

Installation:

npm install --save webaudio-instruments

Usage

var Instruments = require('webaudio-instruments')
var player = new Instruments()

player.play(
    24,        // instrument: 24 is "Acoustic Guitar (nylon)"
    72,        // note: midi number or frequency in Hz (if > 127)
    0.5,       // velocity: 0..1
    0,         // delay in seconds
    0.5,       // duration in seconds
    0,         // (optional - specify channel for tinysynth to use)
    0.05       // (optional - override envelope "attack" parameter)
)

API

var player = new Instruments(audioContext, destinationNode)
Both parameters are optional.
player.names
Array of instrument names
player.play(inst, note, vel, delay, duration, channel, attack)
See above. Note that instruments numbers over 127 are percussion, so the note parameter is ignored. channel, attack params are optional.
player.getCurrentTime()
Time value (from the audio context)
player.setQuality(q)
Set the quality to 1 (high) or 0 (low). Low version uses fewer oscillators, see original repo for details.
player._synth
For anything else, access the underlying tinysynth.

Credit

All the interesting magic here (the implementation of MIDI instruments using webaudio oscillators) is from webaudio-tinysynth! See that repo for further info and more features.

All I've done is to abstract away the MIDI-related stuff, add CommonJS support, etc.

My additions here are MIT license. Original source is Apache 2.0.