make-noise/erbe-verb

Erbe-Verb

A unique, modeless, continuously variable stereo algorithmic reverb with complete voltage control. Mono In, Stereo Out, all-analog dry path, 24-bit 48kHz DSP. Co-designed with Tom Erbe of Soundhack.561

Capabilities 1

Stereo Reverbstereo-reverb: Continuously variable algorithmic reverb with mono input and stereo output. All-analog dry path; wet path is 24-bit 48kHz 32-bit floating-point DSP.561

Jacks 14 — 11 in / 3 out

Name	Signal	Voltage	Description
Inputs (11)
Absorb CV Input	cv	-5V to 5V	561
Decay CV Input	cv	-5V to 5V	561
Depth CV Input	cv	-5V to 5V	561
Mix CV Input	cv	0V to 5V	561
Pre-Delay CV Input	cv	-5V to 5V	561
Reverse Gate Input	gate	≥1.5V	Engages reverse reverb while gate is high (momentary). Requires at least 1.5V to operate.561
Signal Input	audio	—	AC coupled audio input. Expects standard modular signal level of 10Vpp.561
Size CV Input	cv	-5V to 5V	561
Speed CV Input	cv	-5V to 5V	561
Tempo Input	clock	≥1.5V	Clock/gate input for synchronizing Speed and Pre-Delay to multiples or divisions of an external clock. Requires at least 1.5V amplitude and 6ms pulse width.561
Tilt CV Input	cv	-5V to 5V	561
Outputs (3)
CV Output	cv	0V to 10V	Envelope follower output representing average energy of the reverb algorithm. Goes higher as reverb signal gets louder. Useful for feedback patching into the system.561
Left Output	audio	—	Left portion of stereo reverb image; also serves as mono reverb image. AC coupled, up to 10Vpp.561
Right Output	audio	—	Right portion of stereo reverb image. AC coupled, up to 10Vpp.561

Parameters 13

Name	Type	Range	Behavior
Absorb	knob	—	Controls both Diffusion and Damping. Full CCW: 0 Diffusion, 0 Damping. At 10:00: Full Diffusion, 0 Damping. Full CW: Full Diffusion, Full Damping. Increasing Absorb decreases decay time and makes reverb darker. Feedback-based, responds best to slow modulation.561 Zones No Diffusion, No Damping Full Diffusion, No Damping Full Diffusion, Full Damping No Diffusion, No Damping -100–-100%Full CCW: 0 diffusion, 0 damping — fastest decay buildup, most transparent tone.561 Full Diffusion, No Damping -33–-33%At 10:00: full diffusion, 0 damping — maximum echo density buildup, no high-frequency attenuation.561 Full Diffusion, Full Damping 100–100%Full CW: full diffusion and full damping — darkest, shortest decay times.561
Decay	knob	0% – 120%	Unipolar control for reverb decay/tail length. 0–120% reflection gain; infinite self-oscillation at full CW. Feedback-based; slower to respond than Size or Pre-Delay. Responds best to slower control signals.561
Decay CV Attenuverter	knob	—	Bipolar attenuverter for the Decay CV Input.561
Depth	knob	—	Bipolar control for depth and type of internal modulation. Minimum modulation at 12:00 (noon). CCW from noon engages Cyclic (multiphase cascaded chorus) modulation; CW from noon engages Ergodic (random room dimension shifting) modulation. Shimmer at full CW.561 Zones Cyclic Cyclic -100–0%Multiphase cascaded chorus effect, ranging from very subtle chorusing to extreme doppler swirls.561
Depth CV Attenuverter	knob	—	Bipolar attenuverter for the Depth CV Input.561
Mix	knob	—	Blends between dry (unprocessed) analog signal and wet (processed) reverb signal. Acts as a standard panel control when nothing is patched to Mix CV Input; acts as an attenuator for the CV signal when something is patched.561
Pre-Delay	knob	7ms – 500ms	Controls delay before reverb reflections begin arriving. Independent of Size. Using internal clock: 7ms–500ms unipolar. Using external clock: bipolar with divisors/multipliers (1/12 to 12/1 of clock, with 1/1 at 12:00). Also sets Reverse buffer length. Can be synchronized via Tempo Input.561
Reverse	button	—	Toggles reverse reverb on/off (playing Pre-Delay buffer backwards to create reverse reverberations). Can be toggled by panel button or momentarily engaged via Reverse Gate Input. Reverse time is set by Pre-Delay controls. Can be synced to external clock via Tempo Input.561
Size	knob	35cu ft – 9300000cu ft	Ultra-wide range control over the size of the virtual acoustic space, from unrealistically small (full CCW, 'coffin') to unrealistically large (full CW, 'heavens'). Typical settings: Coffin=full CCW, Room=12:00, Plate=1-2:00, Hall=3:00, Ambient=4:00, Heaven=full CW.561 Zones Coffin Room Plate Hall Ambient Heaven Coffin -100–-100%Unrealistically small space (~35 cu ft). Full counter-clockwise position.561 Room 0–0%Small room simulation. Noon (12:00) position.561 Plate 17–33%Plate reverb emulation. Approximately 1:00–2:00 position.561 Hall 50–50%Concert hall simulation. Approximately 3:00 position.561 Ambient 67–67%Ambient/large space reverb. Approximately 4:00 position.561 Heaven 100–100%Unrealistically large space (~9.3 million cu ft). Full clockwise position.561
Size CV Attenuator	knob	—	Bipolar attenuator for the Size CV Input. Controls the amount and polarity of CV modulation applied to Size.561
Speed	knob	0.5cps – 256cps	Unipolar control for the rate of internal modulation. Using internal clock: 0.5–256 cps; using external clock: 1/48–9000 cps. At high speeds smooths aural response; at low speeds modulation is discernible as rhythmic chorusing/evolving/swirling. Note: with Depth at noon (zero modulation), Speed has no discernible effect.561
Tilt	knob	—	Bipolar tone-shaping EQ applied after the reverb algorithm. Unity at 12:00. CCW: high end slightly cut, low end dramatically boosted (thick, thunderous). CW: low end cut, high end dramatically boosted (thin, bright). Low Gain: +12 to -12 dB; High Gain: -24 to +24 dB.561 Zones Low Boost High Boost Low Boost -100–0%CCW from noon: high-end slightly cut, low end dramatically boosted. Thick, thunderous sounds.561 High Boost 0–100%CW from noon: low end cut, high end dramatically boosted. Thinner, bright sound.561
Tilt CV Attenuverter	knob	—	Bipolar attenuverter for the Tilt CV Input.561

Firmware history 1 version

Version	Released	Notes
ev040	—	561

References 2

[561]
Make Noise / Soundhack Erbe-Verb Manualmanual
source 561 canonical ↗ archived ↗

● verified 2026-05-20
[562]
Make Noise Erbe-Verb product page (retired modules archive)product_page
source 562 canonical ↗ archived ↗

⚠ verified 2026-05-20 · manufacturer changed since last verified