Zebralette

Zebralette is a freeware synthesizer built around a single oscillator from u-he’s flagship Zebra synthesizer. Don’t let the “single oscillator” part fool you. This one oscillator is deeper than most synths’ entire engines. Zebralette 3, released in December 2025, is a major upgrade. The new version previews the oscillator engine from the upcoming Zebra 3, with improved CPU performance and several new features. The standout additions are advanced spline-based oscillator editing (allowing smooth, curved waveform transitions instead of traditional point editing) and an MSEG envelope generator that lets you create and morph between up to seven MSEGs.

I’ve been using Zebralette 3 a lot for evolving cinematic textures, and the spline editing is excellent for that. The oscillator section features a 16-slot waveset with GeoMorph, SpectroMorph, GeoBlend, and SpectroBlend modes, plus 24 spectral effects that can warp the frequency content in ways no basic subtractive synth can. Zebralette is a 16-voice polyphonic synth with built-in effects, two LFOs, a ModNoise modulation source (new in version 3), and a collection of presets covering poly sounds, pads, percussive textures, and more.

Zebralette 3 is available in 64-bit AU, VST3, AAX, and CLAP formats for macOS, Windows, and Linux.