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from the maker ::“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.FEATURESTwo 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.
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