STG Soundlabs - Sea Devils Filter
A three pole diode ladder lowpass filter with voltage controlled resonance.
There are two famous 3 pole diode ladder lowpass filters, one of them was in a little silver box of a synthesiser with integrated sequencer that was used to make "Acid Tracks" and the other one was was in a big suitcase of a synthesiser with a silver faceplate and semi- integrated sequencer that was used to make tracks on acid often. this is the latter. I'm not going to name any names here, but I'm hoping I don't have to mention any voltage controlled studios or electronic music studios to establish the lineage of this filter topology.
I can't promise this thing will make Sea Devils appear on your lawn or models of airplanes fly from one side of the stage to the other, crashing into a papier mache sun at the end of your song, so please don't be offended if these things fail to happen while using the filter, presuming you'd want to own one.