G-Storm Electro Pro VCF 3320 Filter Adaptation

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, PPGWave 2

All full resonance the Pro VCF can self-oscillate.

FEATURES

• 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.

INCLUDED | 10-pin to 16-pinEurorack ribbon connector.

NOT INCLUDED | M2.5 or M3 (Doepfer standard) Phillips-head basic zinc rack screws are only provided on special request. Why do I do this? To cut down on rack screws that are wasted in the universe. What's it gotta be? Thousands? Hundreds of thousands? Unused, unwanted. You know the ones I mean | wrong size, wrong color, cheap junk tin, top slot-stripping, rack-rashers, wrong thread count, wrong length, wrong political party, etc. I use thumb screws in 2 sizes myself. So yeah, if you request some M3's from me, I will probably pull the ones from other companies boxes in my closet. You're welcome :D

Specifications:

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

"Wonderful filter! Running the Neutron oscillators with a bit of noise and S&H to their PWM then through this filter results in a VERY Pro-One sound." –Brian, OR

"At this price point this filter is a must own for a mono set up. Sounds great, two channels in and attenuators for $120. Hard to beat that." –Stashy, Modular Grid

“I have Sequential instrument, but this filter sounds much deeper.
I have many VCF, but definitely recommend this if you are looking for a powerful deep sound.” –Toshio, Japan