Available as an assembled Module and as a DIY project.
This Module is currently available.
Dual voltage controlled multi-mode filters
This is an all analog filter module that employs resistors with analog switches to control frequency cutoff. The module has two filters built in which share a common frequency control, these can be used in series or to process stereo signals.
The board features PC mounted pots for less wiring, and mounting holes for flexibility in panel layout. There are Eurorack and MOTM power connectors.
http://www.bartonmusicalcircuits.com/srv/
https://synthcube.com/cart/michael-barton-en/barton-bmc034-switched-resistor-vcf?page=3
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These merchants probably sell this module. Huh?