The Dual Low pass “Dreadful” filter is two independent 2-pole filters based around a V2164 quad VCA chip.
It’s architecture is similar to that found in the Erebus synthesizer.
Each filter has controls for Freq, Res, and CV Amt. Channel 1’s input and CV are internally normal to channel 2 inputs.
Between the filters is a Spread control, an Attenuverter that sweeps both filters in opposite directions. Use this to make filters criss-cross and flip around each other for phaser-like sounds or stereo filtering.
This is an open source design.