Verbos ElectronicsControl Voltage Processor Mixer + Slew


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Verbos Electronics Control Voltage Processor

The Verbos Electronics Control Voltage Processor is a Eurorack CV Mixer, crossfader, and multi-purpose slew rate limiter clearly inspired by the Buchla 257 and Serge Dual Universal Slope Generator (DUSG). It adds an extra layer of nuance to the already multifaceted Verbos ecosystem, adding new possibilities to one of the finest lines of Eurorack modules available.

The two CV mixer sections offer the functionality of the Buchla 257 and more. At their core, these sections are four-channel mixers: the first two channels offer inverting attenuators for level control. The third and fourth inputs are blended via crossfader-style control, which may be voltage-controlled for dynamic signal mixing or VCA-like response when only one input is used. The output of each mixer is then added together with a variable offset. With two of these mixers in one module, any combination of polarization, offsetting, and dynamic signal combination is suddenly accessible; and of course, this adds endless flexibility even just within the context of the Verbos ecosystem itself.

And while these voltage processors alone would have been enough to constitute an endlessly useful module, Verbos have also included an integrated slew limiter in the style of Serge's DUSG. This style of slew limiter is itself a remarkably flexible circuit, capable of everything from filtering and slewing to envelopes, LFOs, and more. The slew generator offers signal and trigger inputs for use as a traditional slew or AD envelope, respectively. A dedicated gate output goes high when the slew signal drops below 100mV, making it possible to turn the processor into an LFO/cycling envelope by patching the gate output to the trigger input. Dedicated CV inputs for the positive and negative slew make CV-enabled shaping and FM a possibility as well.

Slope curve shapes are continuously variable from linear to RC, and the "bounce" parameter provides a unique CV overshoot for special effect.

Adding long-awaited utility to the Verbos family of designs, the Control Voltage Processor is far more than the sum of its parts: a central part of a synthesizer's nervous systems, where signals go to be intermingled and integrated into dynamic, ever-changing new forms.

Control Voltage Processor Features

  • Voltage processor and slew rate limiter inspired by the Buchla 257 and Serge DUSG
  • Slew processor offers independent control of rising and falling slew time with dedicated CV attenuverters
  • Slew can be triggered via manual button or trigger input (which allows for self-cycling)
  • Slew shape continuously variable from linear to RC curve
  • "Bounce" control introduces overshoot to CV changes for peculiar shape animations
  • Two voltage processors, each with two attenuverter channels, CV-controllable crossfader, and offset control
  • Eurorack module
  • Width: 18hp
  • Depth: 30mm
  • Current draw: 85mA @ +12v, 83mA @ -12v
Product Demo Videos
Control Voltage Processor | CV processing & Bounce
To demonstrate the Scaling, Cross-fading and "Bounce" functionality of the Control Voltage Processor, we have the aforementioned controls manipulating two sequences from the Voltage Multistage. In effect, allowing the user immediate access to controls that would take many modules to replicate.
Control Voltage Processor | Complex Envelope Generation
The Control Voltage Processor, with it's two identical CV processing sections, is capable of mixing, scaling, offsetting and cross-fading a total of 8 control voltage signals. To demonstrate this, we called upon the various envelope shapes from the Multi-Envelope which then were blended and scaled within the Control Voltage Processor, finally leading to the CV input of the Amplitude & Tone Controller and the "Timbre" of the Complex Oscillator.

This patch is fairly complicated so we have provided patch notes below:
-An individual output from the top section of the Multi-Envelope was sent into "input 3" while a complete shape (ADAsR) was sent into "input 4" which allows for cross-fading between the two.
-"c.v. b" from the Voltage Multistage handles cross fading duties between the two envelope shapes.
-The bottom envelope from the Mutli-Envelope (which received its gate pulse from 1 step of the Voltage Multistage) was mixed into "input 1" and scaled manually to add an accent like effect to the overall sound.
Verbos Electronics Control Voltage Processor Mixer + Slew Reviews