This project is a dual voltage controlled amplifier. Each has two signal inputs with level adjustment, and two CV inputs (one with level control). The two inputs to the second VCA (the one to the right) can be routed to the first VCA, making the module a four-input VCA. The VCA is based on the ASM-1 VCA.
Unfortunately there are no building instructions for this module, but at least you'll find the schematic, some photos, and some comments.
The finished VCA.
That's it! Have fun and attenuate!