Behringer PRO-1 Synthesizer

Behringer PRO-1 Analog Synthesizer — Classic '80s Mono Sound, Modern Desktop Form

The Behringer PRO-1 Analog Synthesizer is a semi-modular tabletop monosynth inspired by the Sequential Circuits Pro-One, the 1981 monosynth heard on records by Depeche Mode, The Prodigy, and Vince Clarke. It packs the same dual-VCO architecture, 24 dB four-pole filter, and all-analog signal path into a compact Eurorack-ready desktop module. This model is the right choice for synth players who want that fat early-'80s bass and lead character without paying vintage prices.

What Sets This Module Apart in the Behringer Synth Line

Two design choices make this desktop monosynth stand out from typical analog clones. Authentic 3340 and 3320 oscillator semiconductors preserve the vintage-accurate voicing of the original Pro-One rather than relying on modern equivalents. The modulation section offers three sources (filter envelope, Oscillator B, and LFO) routable to five destinations across two mod busses, giving players a deep modulation matrix rarely found at this tier.

Dual Analog VCOs and a Self-Oscillating 24 dB Filter

The voice architecture is built around two analog VCOs with saw, pulse, and triangle waveforms, each with its own pulse-width control. Oscillator A includes a hard-sync switch, while Oscillator B can be switched to low-frequency mode and used as an extra LFO. The 24 dB/octave four-pole low-pass filter reaches full self-oscillation, producing the squelchy resonance that defined the original.

• Oscillators feature dual analog VCOs that provide saw, pulse, and triangle shapes with pulse-width control.
• Filter: 24 dB/octave 4-pole low-pass — self-oscillating for squelchy resonance and sine tones
• Semiconductors: Authentic 3340 and 3320 chips — vintage-accurate oscillator voicing

ADSR Envelopes, LFO, and Deep Modulation Routing

Two ADSR envelope generators shape the filter and amplifier independently. A dedicated analog LFO delivers simultaneous saw, triangle, and square waveshapes and doubles as an internal clock. The modulation matrix routes filter envelope, Oscillator B, and LFO to pitch, pulse-width, and filter cutoff across two mod busses.

• Envelopes: ADSR (filter) and ADSR (amplifier) — independent shaping of timbre and dynamics
• LFO: 1 analog LFO — saw, triangle, and square simultaneously, also acts as clock
• Modulation Sources: 3 (filter envelope, Osc B, LFO) — routable to 5 destinations via 2 mod busses

Built-In Sequencing and Full Studio Connectivity

The PRO-1 includes a 64-note dual step sequencer and an arpeggiator with three patterns, plus a paraphonic two-note mode. Connectivity covers 5-pin MIDI in/out/thru, USB MIDI, six CV inputs, five CV outputs, an external audio input, and a headphone output port. The chassis is Eurorack-compatible and supports Poly Chain linking of up to 16 modules.

• Sequencer: 64-note dual step sequencer — switch between two sequences in real time
• Arpeggiator: 3 patterns (up, down, up/down) — hands-on pattern programming
• Headphone Output: Yes — private monitoring with both L/R channels
• Connectivity: MIDI I/O, USB MIDI, 6 CV ins, 5 CV outs — integrates with modular and studio setups

Ideal for Analog Synth Enthusiasts, Modular Players, and '80s Sound Fans

This synthesizer is the right choice for analog synth players who want the sound and workflow of the Sequential Circuits Pro-One without paying vintage collector prices. It suits electronic producers chasing classic '80s bass and lead tones, sound-design beginners who want every parameter visible on the front panel, and Eurorack users looking for a desktop voice with extensive CV patch points. Poly Chain support means a single module can grow into a 16-voice polysynth as the rig expands.

The Sequential Circuits Pro-One Legacy

The original Pro-One was a 1981 monosynth that became a defining voice of early-'80s electronic music. Artists including Depeche Mode, The Prodigy, Vince Clarke, and Thompson Twins used it on landmark recordings, and its dual-VCO architecture and squelchy four-pole filter became benchmarks for the era. Behringer's recreation preserves that circuit DNA through authentic 3340 and 3320 semiconductors.