The Voice of Saturn VCF is based around the CEM 3372 Signal Processor chip. At one point ca. 2006 I wound up with a decent sized amount of these discontinued chips and I decided to design a filter module around them. I also had a great source for joysticks and loved that sort of user interface control. The result was the VoS VCF. Only ~40 of the full scale units were ever produced or made as a kit due to the limited number of joysticks and CEM chips but the module has also been released in a limited eurorack form. It features cv control over cutoff and resonance of the 24db 4 pole filter as well as cv controls for each of the two input VCAs and the output VCA. I do still have pcbs available for this if anyone one is interested.