The Behringer 140 is a faithful analog reproduction of the Roland System 100M 140 Dual Envelope/LFO module from the early 1980s. It combines two independent ADSR envelope generators with a versatile low-frequency oscillator (LFO) in a compact 16 HP package. The envelopes offer classic percussive curves with manual trigger buttons and gate inputs, while the LFO provides five waveforms, multiple frequency ranges, delay, and both CV/trigger control and multiple outputs—making it essential for adding dynamic modulation, gating, and movement to oscillators, filters, VCAs, or any CV destination in your Eurorack system.
Technical Specifications
| Item | Description |
|---|---|
| Type | Legendary Analog Dual Envelope/LFO Eurorack Module |
| Eurorack Width | 16 HP |
| Depth | 44 mm (1.73″) |
| Weight | Approx. 0.5 kg (1.1 lbs) |
| Power Requirements | Eurorack bus (10-pin or 16-pin connector) |
| Current Draw | +12 V: 40 mA, –12 V: 40 mA, +5 V: 0 mA |
| Envelopes (2 × ADSR, identical) | |
| Controls per Envelope | ATTACK TIME (1.5 ms – 7.5 s), DECAY TIME (4 ms – 15 s), SUSTAIN LEVEL, RELEASE TIME (4 ms – 15 s) |
| Triggering | MANUAL GATE button (press/hold to fire), EXT GATE input |
| Outputs per Envelope | 2 × positive envelope outs (duplicated), 1 × inverted envelope out (shared or per envelope depending on patching) |
| Gate Input | 1 × 3.5 mm TS per envelope, DC coupled, >50 kΩ, min input level for trigger |
| Envelope Outputs | 3.5 mm TS, DC coupled, 1 kΩ impedance, max ~±10 V |
| LFO | |
| Waveforms | Sine, Triangle, Square, Ramp (up), Sawtooth (down) |
| Controls | FREQUENCY, DELAY TIME |
| Frequency Ranges | 3-position switch: Low (~0.05 Hz – several Hz), Medium, High (up to ~30 Hz) |
| Inputs | CV input (for frequency modulation), TRIGGER input (sync/reset) |
| Outputs | 2 × LFO signal outputs (likely positive and inverted or duplicated) |
| Additional I/O | |
| Total Patch Points | Gate inputs (2), envelope outs (multiple positive/inverted), LFO CV/trigger ins, LFO outs (2) |
| LEDs | None (classic 100M style—no visual indicators) |
Key Features & Signal Flow
- Two independent ADSR envelopes – Each with snappy attack-to-release times typical of Roland designs; perfect for gating VCAs, opening filters, or modulating pitch/FM.
- Manual gate buttons – Great for testing patches or live performance without a sequencer/keyboard.
- Inverted envelope output – Invert the envelope shape for negative modulation (e.g., closing filters as envelopes rise).
- Versatile LFO – Five classic waveforms plus delay (fade-in) for evolving modulations; three ranges cover slow sweeps to audio-rate effects.
- LFO sync/trigger – Trigger input resets the LFO phase; CV input allows frequency modulation from envelopes, sequencers, or other sources.
- Classic System 100M modulation power – Combine envelopes and LFO for everything from plucky basslines and swelling pads to complex evolving textures—no extra utilities needed.
- No normalisation – Fully patchable: route envelopes to multiple destinations, mult LFO outs, or cross-patch for wild results.
Resources
- Official Behringer product page: https://www.behringer.com/product.html?modelCode=0720-AAD
- Quick Start Guide (PDF): Available on Behringer downloads or direct links like https://www.behringer.com/downloads.html (search “140”) or community mirrors
- ModularGrid page: https://modulargrid.net/e/behringer-system-100-140-dual-adsr-lfo
- Retailer pages (Sweetwater, Thomann, B&H Photo, Vintage King): Detailed specs, user reviews, demo videos, and sound examples
- Demo videos: Search YouTube for “Behringer 140 Dual Envelope LFO” (patch ideas, waveform demos, envelope curves)
The Behringer 140 is a compact, affordable powerhouse for modulation—delivering authentic 80s Roland envelope snap and flexible LFO animation in minimal space. Essential for any System 100-inspired build or as a utility mod source in larger racks. Highly recommended!
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