Announcing 4023 VCF - an ARP Odyssey MK-I Filter Eurorack Adaptation

Here it is - the mystery module presented yesterday at the Dallas Synth Party.

The 4023 VCF is a no-compromises Eurorack filter adaptation of the MKI ARP Odyssey synthesizers that boasted the colorful 4023 module. Slim. 8HP. Elegant beauty. Don’t be fooled by this early 2-pole 70s design, it retains bass power at higher resonance very well, and can self-oscillate with a robust sine wave when you top out the Resonance.

This 4023 VCF adaptation as close to the original as possible including Rochester re-issue CA3080 OTAs struck from the Intersil masks, matched discrete TO-92 transistors, 2N5459 FETs, a temperature compensation resistor for frequency stability, and six 20mm Alpha slide potentiometers inspired by look of the original. Per usual, when the input sliders are above 75% it will overdrive the filter input for some lovely saturation. 4023 VCF has the classic ARP vibe you’re seeking in spades.