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Sequential Circuits Pro One

Analog Monophonic Synthesizer

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Pro One 1Pro One 2Pro One 3Pro One 4
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Sequential Circuits Pro One
Sequential Circuits Pro One
1 800.00 street price

It is a kind of monophonic version of Prophet 5 (referring to the third revision, with indiscrete VCOs).

It has a standard "prophetic" structure: an analog controlled by a microprocessor.

Unlike Prophet 5, Intel 8021 was chosen as a microprocessor in Pro One which can be explained by the fact that it required fewer resources. The microprocessor provides:

  • Keyboard scanning.
  • Sequencer - two patterns (40 notes each).
  • Arpeggiator - patterns "Up" and "Up/Down".
  • Auto-tune.

The analog part contains:

One was used by 808 State, Juan Atkins, Depeche Mode, Electribe 101, Electronic Dream Planet, Fluke, Frontline Assembly, Gas Chamber Orchestra, Groove Corporation, The Prodigy, Joy Division, Juno Reactor, KMFDM, Die Krupps, LFO, Marilyn Manson, New Order, Nine Inch Nails, Nort, Ozric Tentacles, Rhythmatic, Shamen, Yazoo.

Country of origin / production: USA

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More info
Usage area
Usage Design/ Form Factor
With Keys 
Hybrid, Digital+Analog 
Tone Generator / Sound Synthesis
Oscillator Type VCO (Voltage Controlled Oscillator)
Oscillators per voice2
Waveform/ Spectral form (main generator) Pulse Width Modulation (PWM)
Waveform/ Spectral form (main generator) Triangle
Waveform/ Spectral form (main generator) Saw
Voltage Controlled Filter (VCF) 
Low-pass Filter (LPF) 
Envelope Generator (EG)
Parts count2
Step Sequencer 
Max Step Count40
Arpegiator/ Portamento
Arpegiator Mode Up
Arpegiator Mode Up+Down
Type Synth Action
Number of Keys36
Built-in controllers
Pitch Bend Wheel 
Modulation Wheel 
Audio out
Analogue: 1/4" (6.35mm)1
Audio in
Analog 1/4"1
Voltage 100-230(250)V
Voltage 50-60Hz
Power Supply Built-in, internal
Height130 mm
Width653 mm
Depth417 mm
Weight7 kg
Case/ body
Production start1981
Production end1984
Production ended

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