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Elby Designs
CGS775 Serge VCS Voltage Controlled Slope - 15HP

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Item: N12-1468

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CGS775 Serge VCS Voltage Controlled Slope - 15HP


The CGS775 Serge VCS (Voltage Controlled Slope) is an extremely versatile module capable of many useful functions.

The VCS is a unity gain voltage follower. The rising and falling slopes are independently and jointly voltage controllable over a wide range. The module provides an incedible amount of possible functions.

Slew time can be set separately for rise or fall and be modulated by a control voltage. Separate inputs for rise and fall modulation and also a common input. The modulation controls are bipolar and can be toggled between linear or non-linear behavior. A trigger on trigger input fires an envelope while a gate holds sustain. After a cycle of the envelope a gate signal is generated at the end-out. The cycle switch connects the end-out with the trigger in so the VCS can loop itself and act as an oscillator which frequency can be controlled via the Exp-CV jack. Manual control of waveform with the rise / fall controls. If an audio signal is fed into the module, the pots act as waveshape or cutoff controls.

VC Transient Envelope Generator: A pulse at the trigger input will start the envelope, or a gate input will sustain the level and the envelope will fall when the gate goes low. Rise and fall are independently and jointly voltage controllable, with variable linear and exponential wave shapes.

VC Portamento: Voltage is slewed according to the rise and fall times.

VC LFO: When the cycle switch is thrown, the trigger input is connected internally to the end trigger output, creating a VC clock with variable waveform and independent rise and fall times.

VC Oscillator: While not as wide ranged, or accurate as a dedicated oscillator module, the VCS is still an excellent audio source. The Exp CV input is scaled approximately to the 1v/oct standard. The Output wave can be swept from triangle to saw with linear and non-linear waveforms. End Out also produces a pulse waveform.

VC Non-Linear Audio Processor (Low-Pass Gate): If an audio rate signal is slewed, the module responds like a VCF, and a rough VCA. The signal is low-pass filtered down to silence, similar to a low-pass gate.

Envelope Follower: Positive and negative peak detection envelope follower.

VC Pulse Delay: Trigger input starts the envelope and a trigger will be produced again at the End Out when the envelope completes its cycle.

Sub-Harmonic Generator: If a series of triggers are applied to the VCS faster than the total rise and fall times, the module will divide the incoming signal by a whole number. In the audio range the output will be the sub-harmonic series.


  • Input
  • AC Out: AC-coupled output, best for audio rate
  • Output
  • Output LED inidicator
  • End Out: Outputs gate at the end of each cycle
  • Trigger Input
  • Cycle switch: When engaged the module acts as an oscillator
  • Rise time knob
  • Fall time knob
  • VC Rise, Fall, and Both inputs
  • VC Rise and Fall level knobs: Bi-polar knobs which maybe be pulled to switch from linear to non-linear
  • Exp CV input: Approximately 1V/Octave

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  • Eurorack Module
  • 15 HP Wide
  • 7.3 cm deep

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