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



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


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