At the cutting edge of sound synthesis

Zeeon is a virtual analog synthesizer, powered by an advanced analog circuit modelling engine. We spent a lot of time analysing iconic analog synths, both vintage and modern, to find out which parts of the circuit contribute most to their specific character. We used this knowledge to create a unique synth, with focus on what’s most important - the pure, organic and detailed sound. Many analog synth emulations sound dull. Not Zeeon. We take care of the entire spectrum range from deep lows to sweet highs. All audio and modulation signals are processed at 176 KHz (4x oversampling).


  • Audio Unit v3 and standalone application with a simple polyphonic step sequencer and full MIDI implementation.
  • 2 oscillators with continuously variable waveforms, hard-sync and sub-oscillator. Carefully simulated analog drift and PSU influence.
  • Filter: 3 models available: Transistor ladder low pass, OTA cascade low pass and State Variable Filter with continuously variable LP-HP + BP mode.
  • 2 low frequency oscillators and envelope generators per voice.
  • Overdrive: diode clipper and transistor saturation, pre and post filter.
  • Up to 2 layers per voice. Layers can modulate each other.
  • Powerful modulation matrix offering self-modulation and cross-layer modulation, 8 modulation slots, 17 signal sources and 41 targets available, both from modulation modules and audio signal path. This takes Zeeon into semi-modular territory. Imagine oscillator waveform, panning, filter cutoff, resonance or LP-HP mode modulated by oscillators or another layer!
  • Effects unit: Circuit modelled BBD chorus, bass booster, zero-delay Phaser, Stereo delay and Reverb.
  • 144 presets and Tutorials bank, additional banks available as IAP's.


64-bit iPad or iPhone is required. Zeeon solves millions of nonlinear equations in every second. Despite of heavy optimisations (DSP engine is written in assembly language for powerful ARM Neon) this comes at the cost of quite a high CPU-hit (40-50% on older devices), but we think the sound is worth it.


Idea, development, UI design, presets: Jaroslaw Jacek (BeepStreet)
3d modelling and rendering: Marco Galtarossa
Some cool presets (RSL): Stuart Kilbride

Audio demos

Pads - French touch

Da bass! - some presets

Pads - Analog glory

Layered resonant pad

One key + matrix madness

Ambient depths


Zeeon user guide