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.