synthlet v0.1.0

Synthlet

Collection of synth modules implemented as AudioWorklet in Typescript. Currently is basically a port of Will Pirkle's Audio Effects Plugins in C++ 2nd Ed. book. Thanks Will 🙌

import { Lfo, LfoWaveform, loadSynthlet } from "synthlet";

const context = new AudioContext();
await loadSynthlet(context);

const synth = Lfo(context, { waveform: LfoWaveform.RandSampleAndHold });

Why

Basically, to learn and for others to learn from. Most open source synths are written in C or some other low level language. This library is written in Typescript to make it more accessible (at the cost of performance).

References

• Designing Synth Plugins 2nd Edition

Roadmap

• Envelope
  • ADSR
  • ASD
  • AD
• - LFO
  • Sin, Saw
  • Sample&Hold
• - VA Oscillator
  • Blep algorithms
  • Noise algorithms
• Wavetable Oscillator
• - KarplusString Oscillator
• Granular Oscillator

Setup

Package

Install using npm or any other package manager:

npm i synthlet

Browser

Usage

Load worklets

The first step is to load the worklets into an AudioContext. The simplest way is to load them all:

import { loadSynthlet } from "synthlet";

const context = new AudioContext();
await loadSynthlet(context);

But you can choose which ones to load if you don't need the full library:

import { loadKarplusStrongOscillator } from "synthlet";

await loadKarplusStrongOscillator(context);

Create nodes

You can create the nodes using the constructor functions:

import { Lfo } from "synthlet";

const lfo = Lfo(context, { frequency: 10 });

⚠️ Don't use new in front ot the function.

Connect nodes

Each node is a normal WebAudio API AudioNode so the same principles apply:

const osc = new OscillatorNode(context);
lfo.connect(osc.detune);

Modules

ADSR

An attack-decay-sustain-release envelope.

Lfo

A low frequency oscillator with several waveforms and extras.

Virtual Analog Oscillator

Oscillator based on Blip algorithm