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By  Cherry Audio LLC

Cherry Audio’s Octave Cat synthesizer faithfully recreates the iconic CAT duophonic synthesizer by Octave Electronics from 1976. Developed with the original designer, Octave Cat preserves the growling resonance and aggressive filter while adding expanded polyphony, integrated effects, and a dual-step sequencer.

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Octave Cat Synthesizer

Cherry Audio’s Octave Cat synthesizer faithfully recreates the iconic CAT duophonic synthesizer by Octave Electronics from 1976. Developed in collaboration with the original designer, Octave Cat preserves the distinctive growl and aggressive resonant filter of the original hardware, while expanding on its capabilities.

Octave Cat retains the essence of the original with flexible modulation, screaming audio-range oscillator cross-modulation, and fierce oscillator sync. However, it enhances the experience with expanded polyphony, integrated effects, and a versatile dual-step sequencer.

In partnership with the original designer, Carmine Bonanno, Cherry Audio brings Octave Cat to life with up to 16-voice polyphony and a feature-packed “page two” offering distortion, phaser, flanger/chorus, echo, and reverb effects. Additionally, a super-flexible dual eight-step sequencer allows for modulation of numerous parameters.

Bonanno expresses admiration for Octave Cat, noting its faithful recreation of the original instrument while surpassing its capabilities. With added features like sample and hold glide, step-sequencing, MIDI clock sync, and a suite of effects, Octave Cat offers unparalleled versatility compared to its hardware counterpart.

Cherry Audio’s dedication to preserving the Octave-Plateau legacy ensures Octave Cat’s authenticity and excellence. Crafted with reverence for the original, Octave Cat stands as a testament to the fusion of innovation and tradition, destined to inspire music producers for years to come.


  • All aspects of the original CAT precisely modeled in exacting detail
  • Over 300 presets
  • Dual Panel Views with an authentic Main view for synthesis controls, and an additional FX/Seq panel with extended features
  • Monophonic, duophonic, and polyphonic (up to 16 voices) voice modes
  • Unison for mono and duo modes
  • Two distinct VCOs with discrete wave, modulation, S+H, and sub octave settings; VCO1 with saw, triangle, and pulse with PWM, and VCO2 with square and saw waveforms
  • Vintage-correct four-pole 24 db/oct filter, based on the original “cascaded OTA” SSM2040 filter with precise replication of The CAT’s unique resonance
  • Accurate reproduction of the original’s Transient Generators section with two envelope generators: a standard ADSR (attack/decay/sustain/release), and an AR (attack/release)
  • Sample and Hold with VCO1, VCO2, or Noise as source, with Glide that slews the voltage steps for smoother transitions
  • User-selectable Bend Depth, Octave Shift, and note Glide
  • Tempo-syncable LFO with onset delay
  • White noise generator
  • Classic-style dual-channel, eight-step sequencer, independently assignable to oscillator pitches, filter cutoff frequency and VCA amplitude, with tempo sync, quantization, and keyboard transpose
  • Studio-quality integrated effects: distortion with tube and fuzz, 2/4/8/12-stage phaser, flanger/chorus, three syncable delay types, and five reverb types
  • Selectable original “Mark I” or later-style “SRM” skin
  • Standalone virtual instrument and plug-in versions included
  • Channel pressure and polyphonic aftertouch as a polyphonic modulation source
  • Support for MIDI Polyphonic Expression (MPE) — Pitch, Channel Pressure, and Timbre — making Octave Cat capable of more organic and expressive performances when using MPE-compatible controllers
  • Complete MIDI control and DAW automation for all controls, with easy-to-use MIDI learn and mapping
  • Cherry Audio’s popular Focus zoom-in feature, as well as standard UI zoom and resize via drag
  • Complete documentation available directly online from the instrument or in downloadable PDF format
  • User-adjustable oversampling control



  • Windows 7 or above (Including Windows 11)
  • 64-Bit System
  • Quad Core Computer with 8GB of RAM recommended.


  • MacOS 10.13 or above
  • MacOS 13 Ventura supported
  • 64-bit required
  • Native Apple M1 or greater processor support, including Ultra.
  • 3.4 GHz Quad-Core or M1 CPU with 8GB of RAM recommended.

Digital license code delivery: You will get your unique serial number via email in seconds after the purchase is complete.

No Returns on Software. Once your software is activated it is not eligible for returns.


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