Making its debut in 1981, the monophonic Sequential Circuits Pro-One* quickly established itself as the synthesizer of choice for numerous artists including: Thompson Twins, the Prodigy, Depeche Mode, Vince Clarke, New Order, Prince, Soft Cell and a host of others. An ultra-affordable homage to that iconic synthesizer with all the features of the original and then some, the PRO-1 lets you conjure up virtually any sound with incredible finesse and ease. With its pure analog signal path, dual authentic VCOs with 3 selectable waveforms, plus extremely flexible VCF and VCA filters, the PRO-1 is sure to become one of your favorite keyboards. Owning the PRO-1 is like having your own personal time machine, enabling you to embrace the past - or make your imprint on the future!
True to the Original
Great care has been taken in engineering the PRO-1, including the true to the original analog circuitry, legendary VCO, VCF and VCA designs, all of which combine to make it easy to recreate the classic sound performance. This highly-focused attention to detail is what gives the PRO-1 its ultra-flexible sound shaping capability, which covers everything from super-fat bass and lead tones to stunning effects - and all the way out to the otherworldly sounds of your imagination.
Big, Fat Tones
The inspired synthesizer tracks laid down in the 1980s and ’90s are etched in the annals of progressive rock, wave, EDM and synth-pop music forever, making them truly classic in every sense of the word. The PRO-1 lets you recreate all of that magic - or design incredibly fat and original sounds that will make you a legend in your own right!
Authentic 3340 Oscillator
PRO-1’s 3340 Voltage Controlled Oscillators (VCOs) provides your choice of up to 3 simultaneous waveforms (Oscillator A: Sawtooth and Pulse, Oscillator B: Sawtooth, Triangle and Pulse), with a selectable range of 4 octaves. The VCOs can be modulated via the envelope or the low frequency oscillator (LFO). Performance is further enhanced by the Mixer section, which balances the levels of the internal VCOs and noise generator. This amazing flexibility gives you the tools to be your creative best.
The very heart of PRO-1’s sound is its classic 4-pole filter, which lets you freely experiment with the Cutoff Frequency, Resonance and Envelope and Keyboard amount, and full complement of ADSR (Attack, Decay, Sustain, Release) controls to dial in the perfect sound. PRO-1’s filter Mode switch can be set to either Lo- or Hi-pass for selecting the range of your choice.
16-Note Poly Chain Ready
While it is a monophonic instrument (one note at a time), PRO-1’s 16-note Poly Chain function lets you combine multiple synthesizers for up to 16-voice polyphony - plus provides vastly improved reliability and stability over its 1970s and '80s predecessors.
Designed to handle the rigors of life on the road or in the studio, your PRO-1 can easily be transferred into a standard Eurorack case for the perfect integration into your existing system.
Rock Right out-of-the Box!
Your PRO-1 comes ready to rock, thanks to its default signal routing that doesn’t require lifting a single patch cable to instantly create amazing sounds. The semi-modular architecture lets you easily tap into the inspired sounds of 1980s and ’90s progressive rock, wave, EDM and synth-pop music synthesizer tracks that made rock and roll history - or to design incredibly fat and original sounds that will make you a legend in your own right!
The Envelope, Please...
Make that envelopes! PRO-1’s Low Frequency Oscillator (LFO) features your choice of Sawtooth, Triangle and Pulse waveforms with a sweepable frequency range from 0.1 to 30 Hz - plus 2 separate Envelope generators for modulating the VCF and VCA.
Onboard Sequencer & Arpeggiator
PRO-1’s dual 64-note sequencers allow you to record and playback your choice of 2 unique patterns, which can be played either in Keyboard mode, where you create and store the pattern, or Step mode, which allows you to interact while composing the pattern. The onboard Arpeggiator switch features 3 positions, Up (ascending), Down (descending) and Off. Both sequencers and the arpeggiator are fun, mesmerizing and totally addictive...
The LFO, the Matrix & More
Thanks to its dedicated and fully-analog LFO, PRO-1 lets you choose from triangle, pulse or square waveforms and features a single Frequency control for ultra-easy operation. Additionally, the onboard Modulation matrix lets you set the Amount of Filter Envelope, Oscillator B and LFO modulation is applied to the signal, and how. You can even modulate the pulse wave via the LFO, envelope or manually - for sounds ranging from mild to wild!
Controls & Connectivity
We just can’t help ourselves - like you, we're gear-heads, too. For those who want the numbers, PRO-1 has 56 controls, all laid out in a highly-intuitive format that puts the joy back into your music creation. And you can expand PRO-1’s tone-sculpting capabilities beyond your wildest dreams by utilizing the patchbay for incredibly vast and flexible patching options!
- Amazing analog synthesizer with dual VCO design allows for amazingly fat music creation
- Authentic reproduction of original circuitry with legendary 3340 and 3320 semiconductors
- Pure analog signal path based on authentic VCO, VCF and VCA designs
- 3 simultaneous oscillator shapes (OSC A: Saw / Pulse, OSC B: Saw / Triangle / Pulse waveforms)
- Classic 4-pole filter design with self-resonance capability
- Powerful modulation matrix for 2 modulation buses for flexible music creation
- Dedicated and analog LFO with simultaneous Sawtooth, Triangle and Square oscillator shapes
- 2 envelope generators for modulation of VCF and VCA
- Easy-to-use 64-note dual sequencer (LFO clock serves as master clock)
- Arpeggiator with 3 patterns for great sound effects
- 16-voice Poly Chain allows combining multiple synthesizers for up to 16 voice polyphony
- Complete Eurorack solution main module can be transferred to a standard Eurorack case
- 56 controls give you direct and real-time access to all important parameters
- Audio input for processing external sound sources for enhanced creativity
- External control inputs and outputs (Gate, Filter etc.)
- Comprehensive USB/MIDI implementation with MIDI channel and Voice Priority selection
- 3-Year Warranty Program*
- Designed and engineered in the U.K.
Number of voices
Type of oscillators
2 x 3340
2 (32.70 Hz to 8372.02 Hz across 4 ranges)
1 (0.08 Hz to 30 Hz)
1 x 4-pole low pass (24 dB/octave slope)
1/4" TS, unbalanced max. +12.0 dBu
1/8" TRS, unbalanced max. 7.5 mW@32 Ohm
Headphones output impedance
2 x 5-pin DIN/ 16 channels
USB 2.0, type B
Type: Class compliant USB 2.0, type B
Supported operating systems: Windows 7 or higher/ Mac OS X 10.6.8 or higher
Frequency (OSC A&B): 0 to 10
Octave 0, 1, 2 or 3
Pulse Width (OSC A&B) 0 to 10
Shape (OSC A&B): Sawtooth, Pulse,
and Triangular (OSC B only)
OSC A sync: on/off
OSC B LO Freq or Normal
OSC B KYBD or Off
From Filt env 0 to 10
From OSC B 0 to 10
From LFO 0 to 10
From Filt env: pitch bend wheel or direct
From Osc B: pitch bend wheel or direct
From LFO : pitch bend wheel or direct
To OSC A Freq: pitch bend wheel, off or direct
To OSC A PW: pitch bend wheel, off or direct
To OSC B Freq: pitch bend wheel, off or direct
To OSC B PW: pitch bend wheel, off or direct
To Filter: pitch bend wheel, off or direct
Controls: OSC A, B and Noise/External input
Controls: Rate: 0 to 10
Switches: Auto or Normal
Controls: Frequency 0 to 10
Switches: Sawtooth, Triangle and Pulse
Switches: Seq 1, off or Seq 2 (64 note)
Record or Play
Switches: Up, off or up/down
Poly or mono
Retrig or normal
Repeat/ext or normal
Drone or off
Cutoff frequency: 0 to 10
Resonance: 0 to 10
Env amount: 0 to 10
KYBD amount: 0 to 10
Attack: 2.0 mS to 6.5 S
Decay: 2.0 mS to 15 S
Sustain: 0 to 5 V
Release: 2.0 mS to 25 S
Attack: 2.0 mS to 6.5 S
Decay: 2.0 mS to 15 S
Sustain: 0 to 5 V
Release: 2.0 mS to 25 S
Volume: 0 to 10
Master tune -5 to +5
Inputs (TS 3.5 mm)
Mod Wh CV: 0 V to +5 V
OSC CV: -5 V to +5 V
Gate/Clk: More than 2 V (envelope triggers @ 2V)
LFO CV: -5 V to +5 V
Ext: Input impedance: 85 Kohm
Cutoff CV: 0 V to +5 V
Resonance CV: 0 V to +5 V
Outputs (TS 3.5 mm)
LFO out: Triangle: +/-2.5 V, Pulse: +4 V, Sawtooth: +5 V
KB CV: 0 V to +7 V
Gate: 0 V / +5 V
Mixer: 1/8" TRS, unbalanced max. +20.0 dBu
Filter env: 0 V to +5 V
Amp env: 0 V to +5 V
Phones: Signal output
Audio out: Signal output
External power adaptor: 12 V DC
Power consumption: 8 W maximum
Operating temperature range: 5 deg C to 40 deg C (41 deg F to 104 deg F)
Dimensions (H x W x D) : 95 x 424 x 136 mm (3.7 x 16.7 x 5.4 ")
Weight: 1.8 kg (4.0 lbs)
Eurorack HP: 80
Customers also viewed