From the famed Orgon Enigiser - a multimode filter and VCA in 12hp.  Circuit based on original Enigiser prototype kindly loaned by Anthony Linell of Northern Electronics.

VCF

Unique configuration with 3x4 filter modes

2x audio input with drive

2x cutoff CV attenuverter inputs

1x cutoff CV input, tunable to 1v/oct

VCF output normalized to VCA input

VCA

1x audio input with gritty drive, normalized from VCF output

2x CV input.  CV1 knob adds offset for drone etc.

CLIP switch for old/new revision Enigiser diode setting adjusting drive character.

+12V 22mA

-12V 22mA

Skiff friendly

Includes power cable, 4 screws + plastic washers

Available in sand blasted silver and black panel versions.