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G-Storm Electro Pro VCF 3320 Filter Adaptation

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About This Listing

The Pro VCF is a faithful adaptation of a well-known 4-pole synthesizer filter in Eurorack.  

The core of this design lies an Alfa AS3320 filter chip based on the original Curtis. Countless synthesizers used the 3320: Sequential Pro One, Prophet 5 rev 3, Drumtraks, Crumar Trilogy, Stratus, Elka Synthex, some Fairlight CMI, Linndrum, Oberheim OB-8, OB-Xa, PPG Wave 2

All full resonance the Pro VCF can self-oscillate.


  • Two selectable filter slopes: original 24 db/oct, and 12 db/oct.
  • Two voltage controlled input jacks for frequency CUTOFF w/ signal attenuators.
  • A voltage controlled input jack for RESONANCE w/ a signal attenuator.
  • Two signal input jacks w/ individual attenuators. At full clockwise, these inputs can overdrive the filter from most eurorack oscillators and audio sources.
  • Includes a 10-pin to 16-pin Eurorack ribbon connector.


  • Inputs - 2 Audio Inputs, 3 CV Inputs
  • Outputs - 1 Mono Output
  • Current – 10mA +12V, 11 -12V, 0mA +5V (not used)
  • Depth - 22mm
  • Width - 8HP, 40.5mm

Product Specs

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.learn more
Made In
  • United States

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