Key data

Quad VCAr

Parameter Value
Width 12HP
Depth 25mm
+12V current 50mA
-12V current 50mA
Lifetime 06/16 to 09/20
Modulargrid Link

Original printed manual

PDF download


The cornerstones of modular patches

VCAs are absolutely essential in a modular system, for example for:

  • Shaping the amplitude or timbre of a tone with an envelope.
  • Animating a mixture of several oscillators.
  • Controlling the amount of filter modulation with a random source or a touch controller.
  • Applying an envelope on the linear FM signal hitting an oscillator.


  • All inputs DC-coupled.
  • All inputs handle audio-rate signals.
  • Input impedance: 100k for all inputs.
  • Gain scale: a +5V CV translates to a gain of 1 (0dB), both in linear and in exponential mode.
  • Large gains above +20dB (sufficient for amplifying line-level signals) achievable in exponential mode.

Revisions and variants

57 units made in 2020 had a defective V2164 IC which caused one or several channels to have an asymmetrical response: the positive or negative half of the waveform was processed with a different gain. These modules were sold at a discount, and are identified by a broken heart drawn on the box, and a turquoise knob on the affected channel(s).