Burns Audio has had the bright idea of taking the code from four MIT-licensed open source Eurorack modules that were created by Mutable Instruments and turning them into free iOS Audio Units plugins.
Known collectively as Spectrum and available in a bundle, the modules in question are:
- Spectrum: Multimode eight-voice polyphonic oscillator featuring 14 algorithms
- Modal: Modal synthesis. Bowed, blowed and struck sounds through a 64-band resonator. Also included as an effect.
- Resonator: Seven string generation algorithms. Also included as an effect.
- Granular: Granular sampler, looper, pitch shifter, reverb effect.
Each plugin also features an LFO, ADSR envelope, XY touchpad (except Modal) and 2-source modulation matrix. MIDI CC control of all parameters is offered, too.
You can download the Spectrum Synthesizer Bundle for free from the Apple App Store (opens in new tab).