Zap audio-controlled synth

Yes, it's free! / Download Zap 1.0.0 / User manual

Zap is a unique mini-synthesiser controlled by incoming audio. It starts with an envelope follower that tracks the peak energy of the sound and then applies it onto the frequency of a monophonic oscillator. With three different oscillator waveform modes and features like envelope stepping, Zap can turn any sound source into dynamic synth sweeps, sub-basses, blips, chirps or glitches.


Zap has a simple and stylish user interface built with colour-coded graphics and full Retina resolution support. It has subtle animations and a live output waveform view, making even such a simple effect very fun and engaging to work with. And yet, thanks to hardware-accelerated rendering, Zap feels fast and responsive even on older, lower-end Macs.

imageWatch video demo on Vimeo


  • Signal envelope follower with variable lag time and curve, plus level stepping feature.
  • Three oscillator modes: pure sine, ring-modulated sines & phase-modulated sines.
  • Realtime output waveform display.


Zap works with Logic, GarageBand, Live, MainStage, ReNoise, Reaper, Studio One, Digital Performer, Tracktion and other software that supports Audio Unit effect plugins. It comes in 32/64 bit format for Intel Macs running OS X 10.6 or later, and supports Retina screen resolution.