PRO-1 Analog Synthesizer Desktop Module

Inspired by the classic Sequential Circuits Pro-One from the early '80s, this desktop module brings that raw analog attitude into your modern setup with a semi-modular twist perfect for Eurorack integration.

At its core, dual CEM3340 VCOs deliver thick, detunable tones—oscillator A with sawtooth and pulse waves, oscillator B adding triangle for extra warmth, both with PWM and sync options. A 4-pole 24dB/octave low-pass filter based on the Curtis 3320 chip screams into self-oscillation, paired with separate ADSR envelopes for VCF and VCA, plus an LFO offering triangle, ramp, and square waves. Hands-on controls include grippy knobs, toggle switches for waveforms and mutes, a mixer for oscs/noise/external input, two modulation buses, and performance tools like a dual 64-step sequencer (switchable on the fly), arpeggiator (up/down modes), drone, and repeat functions. MIDI DIN/USB, CV/Gate ins/outs, clock I/O, Poly-Chain for up to 16 units in paraphonic stacks, mono 1/4" out, and headphone jack all fit into a sturdy 12.6" x 8.9" x 3.4" (80HP) frame weighing 4.85 lbs.

Players love its punchy basses, versatile leads, and intuitive layout for live tweaks, often praising the authentic '80s vibe at a fraction of vintage prices—though the compact switches demand a steady hand. It's a standout in Behringer's analog lineup for anyone chasing classic monosynth power without breaking the bank.