Amplitude & Tone Controller

The Amplitude & Tone controller is a totally discrete VCA with simultaneous exponential and linear CV input. It also contains an all discrete, Vactrol based VCF with diode limited resonance. It also has a discrete input gain stage. Careful balancing of the input gain and resonance control sets the mix of self oscillation and input signal, distorted on the VCA input if desired.

There are no ICs in the signal path.

• 16 HP

• 30mA +12, 20mA -12



The Bark Filter Processor is a 12 band fixed filter bank with individual outputs and envelope followers on each band as well as a voltage controlled mixer for blending the outputs. The filters are steep, 6th order bandpass filters with yellow LEDs indicating the level at the envelope followers’ outputs. The voltage controlled mixer has sliders and individual CV ins and draws the, “center”, “width” and “tilt” controls from the Harmonic Oscillator allow- ing the fixed filters to be scanned across blended and mixed in various ways, all at the same time. The even and odd filters can be patched in and out separately and one side’s followers can control the other side’s levels like a vocoder.


210mA +12, 185mA -12


Complex Oscillator

In the West Coast philosophy of synthesis, one oscillator modulating another is a classic way of creating rich timbres. Voltage control of the modulation and of the waveshape is essential for evolving the sounds from whatever CV sources.

The Verbos Electronics Complex Oscillator is configured as a master oscillator with an voltage controlled waveshaper and a modulation oscillator that can be used for FM or AM.

The waveshape of the modulation can be set to triangle, square or saw, each with a dedicated output.  Modulation amount can be voltage controlled with a reversing attenuator on the CV input.

The master oscillator has dedicated outputs for triangle, square and sine waves. The master output can blend from sine to square to saw to folded sine all from voltage control with reversing attenuators on all of the CV inputs.

The oscillators are analog triangle cores with discrete transistor exponential converters. Each has inputs for linear and exponential FM. Both have 1 volt/octave trimmed CV inputs as well.


• 32HP

• 70mA +12, 50mA -12


Dual Four Pole

Like a time traveler from the tape music studios in San Francisco and New York in the 1960s, this dual filter (based on the core of a classic all discrete transistor filter built way back then), arrives to your studio.

The left side is a hipass filter with two cutoff CV inputs, each with a reversing attenuator and voltage controlled resonance. The right side is a lowpass filter with two cutoff CV inputs, each with a reversing attenuator and voltage controlled resonance.
These old school filters will not self oscillate, but they will screech and growl with the best of them. No IC amplifiers anywhere in the signal path.


• 21HP

• 40mA +12, 10mA -12


Harmonic Oscillator

For the first time in Eurorack, this oscillator module provides outputs for  the first 8 harmonics as sine waves. Also included are triangle, saw, square waves. A voltage controlled mixer with various methods of address allows the user to scan, tilt and mix the harmonics from both panel and external voltage control.

It is built on a discrete, all analog triangle core with an old school discrete transistor exponential converter. It has inputs for linear and exponential FM, the exponential with a reversing attenuator. Of course there's a 1 volt/octave trimmed CV input as well.


• 32HP

• 120mA +12, 90mA -12



Reimagining the envelope generator, several shapes of 4 stage functions are available simultaneously on each of the two parts in the Multi-Envelope. From the same set of controls and voltage control inputs, each shape has its own dedicated output. All at the same time... Delay Attack Decay Sustain Release, Attack Hold Decay Sustain Release, Delay Attack Hold Release and (on the upper generator) Attack Decay Attack Release. End pulse outs allow chaining and looping. Gate and Trigger inputs can be used alone or together to control re-trigger characteristics. The "shape" control blends continuously from linear ramps to RC curves typical of East Coast Synthesis, without changing the overall time. The upper generator also has gate outs that are high during each stage.


• 22HP

• 90mA +12, 60mA -12

Mult EDIT.jpg


Not as simple as it may appear, this is a dual passive 4 way multiple. It is important to have the ability to split signals to send them to multiple destinations. Also, because the pulse outputs on Verbos Electronics modules are floating diodes, which allows these mults to be used as boolean ORs for pulse signals within the system.


• 3HP




Rooted in the California modular tradition, the Random Sampling is a selection of random voltage sources to add an element of uncertainty to both audio and control paths. Some of them classics and some new twists. Included are 2 fluctuating randoms capable of slowly varying voltage or sweepable audio noise, each with an uncorrelated random gate output. A two output, up to 6 bit digital stored random voltage source. White, pink and metallic (TR- 808 cymbal type) audio noise. A 4 stage analog shift register where each sample & hold can be broken out of the chain to be used separately.


• 18HP

• 120mA +12, 80mA -12



In a minuscule amount of space, the Scan & Pan provides a 4 channel mixer with voltage control of level and panning. Since the level control was already there, the "width" and "center" controls from the Harmonic Oscillator are included to allow the user to Scan across the channels, fade between them or actively mix them together. It's signal path is all discrete transistors.


• 14HP

• 50mA +12, 20mA -12



A 5 stage analog sequencer with the ability to transpose the sequence with an external voltage applied to the transpose input. Also, signals can be routed and selected with two 5:1 selectors. Any stage can be jumped to with stage select inputs and front panel buttons or selected with analog voltage.

• 16HP

• 50mA +12, 30mA -12


Voltage Multistage

In theory, a sophisticated enough control voltage source can replace all of the control voltage sources in a modular system. That includes saw, square, pulse, triangle LFOs, AR, AD, ADSR, multistage envelopes, tracking generators, quantizers and of course sequencers.

It is not practical to actually replace all of these with one module type, but the Verbos Electronics Voltage Multistage can create any of these control signals.

As a sequencer, it  has switchable slides and gates on each stage. Gate are output musically to match slides and stepped stages.  As a multistage envelope, any stage can be the sustain. Stage "TIME" can be voltage controlled.

The "ref." output is a falling ramp the length of the entire stage. This is usable as a decay envelope the length of the stage.

When the "strobe" input is pulsed, the setting of the "analog" control and CV input selects the stage. This is usable as a reset or to jump to any specific stage of the sequencer.



• 70mA +12, 30mA -12

Skiff sold separately 

Skiff sold separately 


In the great tradition of West Coast synthesis, the Verbos Electronics Touchplate Keyboard is a gold plated controller with 3 independent sections for sending control voltage signals. First is a 32 key volt/oct trimmed piano arrangement with 3 octave selects. It has an output for pitch CV, pressure (actually a measurement of the surface area of the finger touching the key), gate and 10ms trigger. Second is a pressure sensitive up/down bender that can be used to bend the VCO or anything that needs bending. Finally, an 8 key tunable keyboard with CV pressure and gate outputs. The Keyboard can be powered from normal Euro power or an external 9-15 volt positive tip DC supply, for use with un-power skiffs.  


• 84HP

• 120mA +12