This Module is currently available.
Dual version of Oakley's Journeyman VCF
The Oakley Journeyman VCF completely non-linear response and discrete circuitry gives it a unique sound of its own. The Journeyman can be configured in either high pass or low pass modes by the flicking of a switch. When two of these VCFs are used together, one in HP and the other in LP, then the effect is astounding.
The filter heart is made entirely from a single ended discrete design and uses four matching diodes as the control elements. The filter behaves differently depending on the input signal level hence the ‘drive’ pot on the front panel. Turning this up allows the filter to be overdriven. At full resonance the filter will oscillate across most of the audio band.
A switch is provided to allow VCF # 2 to be normalized in series or parallel to VCF # 1
The Journeymen comes in a 2U width with 1″ (25.4mm) knobs controlling 8 potentiometers
The module operates at +/- 15V and comes with a Synthesizers.com style power connector. Only a single power connector is required for this module.
https://richsstudioproject.wpcomstaging.com/product/journeymen-voltage-controlled-filter/
These merchants probably sell this module. Huh?