This filter is part of my Eurorack series. The design is based on the Steiner-Parker diode filter, and I stripped it down to a minimal set of components while keeping its characteristic sound. It has controls for frequency cut-off, resonance and CV level. There are distinct inputs for low-pass, band-pass and high-pass, which allow all sorts of filter responses when combining them.
More technical details and assembly guide can be found at https://polykit.rocks/vcf