reverb.com - Though lesser known and exceedingly rare (we've only ever had one other listed on the site), the Oberheim Voltage Controlled Filter was used by Frank Zappa in a number of
MATRIXSYNTH: Oberheim VCF-200 Analog Synth Filter S/H Pedal
CEM3320 Filter designs – Electric Druid
Oberheim VCF / Maestro FSH - SabroTone
FM4 Filter Modeler
Vintage Oberheim Model VCF-200 Voltage Controlled Filter pedal | Reverb
Doepfer - A-106-6: XP Filter – Noisebug
Doepfer A-106-5 SEM Filter – Thomann Elláda
Products
Tom Oberheim SEM with MIDI to CV Converter — Eurorack and Modular in Asia and the USA
MATRIXSYNTH: Oberheim VCF-200 Analog Synth Filter S/H Pedal