eriser / audio-slot

Web Audio API FRP wrapper for creating, routing, and triggering AudioNodes.

audio-slot

Web Audio API FRP wrapper for creating, routing, and triggering AudioNodes.

This module serves as the audio engine for Loop Drop.

Related modules / deps

• audio-slot-param
• observ-node-array
• observ-struct

Example

Create a simple monosynth:

var Slot = require('audio-slot')

var context = {
  audio: new AudioContext(),
  nodes: {
    oscillator: require('audio-slot/sources/oscillator'),
    filter: require('audio-slot/processors/filter'),
    envelope: require('audio-slot/params/envelope'),
    lfo: require('audio-slot/params/lfo')
  }
}

var synth = Slot(context)
synth.set({
  sources: [
    { 
      node: 'oscillator', 
      shape: 'sawtooth', 
      amp: {
        node: 'envelope',
        value: 0.6,
        attack: 0.1,
        release: 1
      },
      octave: -1,
      detune: {
        value: 0,
        node: 'lfo',
        amp: 40,
        rate: 5,
        mode: 'add'
      }
    }
  ],
  processors: [
    {
      node: 'filter',
      type: 'lowpass',
      frequency: {
        node: 'envelope',
        value: 10000,
        decay: 0.6,
        sustain: 0.05,
        release: 0.1
      }
    }
  ]
})

synth.connect(context.audio.destination)

// trigger!
setTimeout(function() {
  synth.triggerOn(1)
  synth.triggerOff(2)
  synth.triggerOn(3)
  synth.triggerOff(4)
  synth.triggerOn(5)
  synth.triggerOff(7)
}, 0.2)

Included nodes

Sources

• oscillator
• sample
• granular
• noise

Processors

• bitcrusher
• delay
• dipper
• filter
• freeverb
• gain
• overdrive
• pitchshift
• reverb

Params

• chromatic-scale
• envelope
• lfo
• link-modulator
• trigger-value