subpoly

A Web Audio subtractive, polyphonic synthesizer. Just need one voice? Check out submono!

Create a synth.

var audioCtx = new AudioContext();
var synth = new Polysynth(audioCtx);

Your new synth has an array of submono voices attached.

Play a note.

synth.voices[i].start();

Stop playing.

synth.voices[i].stop();

Play all voices.

synth.start();

Stop all notes.

synth.stop();

Use methods to access a voice's pitch and waveform...

synth.voices[i].pitch(440);              // in hertz
console.log(synth.voices[i].waveform()); // 'sawtooth'

...get or set any other properties directly.

synth.voices[i].maxGain = 0.5; // out of 1
synth.voices[i].attack = 1.0;  // in seconds

Use methods to set any property for all voices at once.

synth.maxGain(0.5);         // out of 1
synth.attack(1.0);          // in seconds
synth.pitch(440);           // in hertz
synth.waveform('sawtooth'); // or sine, triangle, square

Set the stereo width.

synth.width(1.0); // out of 1

Configure any or all the properties on initialization.

var config = {
  waveform: 'sawtooth', // or sine, triangle, square
  pitch: 440,           // in hertz
  maxGain: 0.5,         // out of 1
  attack: 0.1,          // in seconds
  decay: 0.0,           // in seconds
  sustain: 1.0,         // out of 1
  release: 0.8,         // in seconds
  stereoWidth: 0.5,     // out of 1
  numVoices: 5,         // unlimited
  cutoff: {
    maxFrequency: 7500, // in hertz
    attack: 0.1,        // in seconds
    decay: 2.5,         // in seconds
    sustain: 0.2        // 0-5; maxFrequency multiplied by this
  }
};

var synth = new Polysynth(audioCtx, config);

Demo

musical typing