PRO-1
The Behringer PRO-1 is an analog semi-modular paraphonic synthesizer recreation of the legendary Sequential Circuits Pro-One, featuring dual Curtis-clone CEM3340 oscillators, a 24dB/oct 4-pole lowpass filter, dual 4-stage envelopes, dual 64-step sequencers, and Eurorack-compatible CV/Gate patch points. NOTE: Voice parameters (such as cutoff, resonance, mixer levels, and envelope times) are controlled by physical potentiometers on the front panel and do not transmit or receive MIDI Continuous Controller (CC) messages. However, the PRO-1 receives Web MIDI note tracking, pitch bend, gate triggers, and paraphonic dual-note allocation.
💡 How to configure the Behringer PRO-1 in closeby.one▼
To connect your Behringer PRO-1 to your web browser, connect your synth using a USB cable or a dedicated USB-to-MIDI interface.
Open the MIDI Settings panel above, set the Output Port to your connected PRO-1 device, and select the correct MIDI channel (default is channel 1). Once configured, you can trigger notes, play sequences and arpeggios, synchronize master MIDI clock, and document patch routing sheets directly in your browser.
Web MIDI Hardware Controller
Route live note tracking, test triggers, and clock sync to your synthesizer.
Physical Patchbay Connections
0 CablesPhysical Discrete Analog Architecture
The Behringer PRO-1 utilizes a discrete, hands-on analog signal path where timbre parameters (such as filter cutoff, resonance, oscillator waveform mixers, and envelope timings) are wired directly to physical potentiometers. Because there are no digital encoders or DAC-controlled VCAs on the parameter circuits, voice controls do not transmit or receive MIDI Continuous Controller (CC) values.
However, the PRO-1 integrates seamlessly with closeby.one for Web MIDI note sequencing, polyphonic/monophonic melody lines, arpeggios, and rock-solid MIDI clock synchronization.
Hardware Engine & Sound Generation
Dual CEM3340 discrete analog VCOs with Sawtooth and Pulse waves (VCO A) and Saw, Pulse, and Triangle waves (VCO B) with Hard Sync, Pulse Width Modulation, and White Noise generator
Classic 4-pole (24 dB/octave) analog Low Pass Filter with self-oscillating resonance, Keyboard Tracking, and dedicated Filter Envelope modulation depth
Dual analog 4-stage ADSR envelope generators for Filter Cutoff and Amplifier VCA modulation
Analog LFO with Sawtooth, Triangle, and Square waveforms, routable via the onboard Modulation Matrix
Dual 64-step step sequencers with step input and multi-pattern arpeggiator
Supported MIDI & Sequencing Features
CV / Gate Modular Routing & Patchbay
Eurorack-compatible 3.5mm minijack CV/Gate matrix (Inputs: Gate, Pitch CV, Filter CV, Amp CV, LFO CV; Outputs: Pitch, Gate, LFO, Envelope)
Launch closeby.one Studio with PRO-1
Drive patterns, acid basslines, polyrhythms, and master clock directly from your browser.
Firmware & Help Reference
MIDI Troubleshooting
🚨 Enabling Duophonic / Paraphonic Play
Set the Poly/Mono mode switch on the front panel to 'Poly'. When sequencing two notes from closeby.one, Osc A will play the lowest note and Osc B will play the highest note.
🚨 Setting the MIDI Channel on the PRO-1
Use the 4 DIP switches on the rear panel to set the MIDI receive channel (1–16), or connect via USB and configure channels via the Behringer SynthTool software.
Recommended lessons.
Crafting an Acid Bassline
Sequencing the Rolling Bass Pattern
Sequencing a Motown Soul Bassline
Deconstructing the 80s Trance Riff
Suggest Profile Edit
Suggest adjustments to device descriptions, engine specifications, and hardware notes.