The Pro-One is one of the most iconic monophonic synthesizers ever built. Designed by Dave Smith in 1981, it defined the sound of an era with its aggressive oscillators, screaming filter and intuitive modulation matrix.
Coded from the original schematics and service manual, The-One models every stage of the signal path with its imperfections, the very ones that give the Pro-One its character. It's not a reproduction, it's a study that sounds.
Key Features
Raw oscillator character
Two CEM 3340 oscillators with saw, pulse, and triangle waveforms. Variable pulse width, hard sync, and a dedicated LFO give you the full palette of Pro-One timbres, from fat basses to screaming leads and evolving textures.
The filter that defines the sound
The CEM 3320 4-pole low-pass filter is the heart of the Pro-One. Our OTA-based model captures its unique saturation, the screaming self-oscillation, and the musical keyboard tracking that lets you play the filter chromatically.
Deep modulation, instant results
Three sources, five destinations, two independent buses. The modulation matrix faithfully reproduces every routing of the original, with circuit-accurate gain staging. Add the tube and tape saturation for extra warmth and grit.
Specifications
Circuit-level emulation of the Sequential Circuits Pro-One (Model 100, 1981)
2 MinBLEP oscillators (CEM 3340) with saw, pulse, triangle, hard sync
4-pole 24dB/oct OTA filter (CEM 3320) with self-oscillation
2 ADSR envelopes (CEM 3310) with true exponential curves
CA3280 OTA VCA with circuit-accurate transfer curve
Full modulation matrix: 3 sources, 5 destinations, Wheel/Direct buses
LFO with saw, triangle, square waveforms and gate sync
40-step sequencer (2 banks) with real-time transposition
Arpeggiator (UP / UP-DOWN) with DAW tempo sync
Koren 12AX7 tube and Revox B77 tape saturation extra
Mono/stereo algorithmic reverb extra
20 factory presets from the original Owner's Manual
MIDI Learn on all knobs, sidechain audio input
VST3 & AU · macOS & Windows
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