Available as an assembled Module and as a DIY project.
This Module is currently available.
Geosync Series 1 - VCA (Squared)
The GS1-A2 is a 6hp version of the GS1-A.
Two inputs, two modulation inputs and two outputs vs the 3 of each on the GS1-A
See GS1-A for more details, circuits are identical otherwise.