Serge Variable Slope VCF
The VARIABLE Slope VCF (VCFS) is unique is that the slope of the filter cutoff is variable manually or by voltage control from 6db/octave with little or no peaking to 12db/octave with noticable peaking at the cutoff frequency
Lowpass, bandpass and highpass output are simultaneously available and a small mixer allows 2 inputs to be manually mixed without using an external module
My Serge VCFS was bought as a semi-kit from SMMS (Serge Modular Music Systems) in the early 1980's
This module can be built as semi-DIY with a PCB from Random*Source. All Random*Source Serge modules are authorized by Serge Tcherepnin.
Info on the Random*Source module is HERE