Not only control voltages can be used to "open" the VCA and to let the inputs pass through, there is also a manual gain control. This is pretty handy when you want to modulate the VCA with a bi-polar voltage - just turn up the gain haf-way - this way you can use the CV's negative signal parts for closing the VCA.
As the module has two signal inputs often you don't need a mixer before the VCA.
Over the years the module has been revised and improved. Since the 3rd version, from 2013 on, it has a new circuitry which utilized quality integrated circuits SSM2164 / V2164 which show a higher signal-to-noise ratio and a better distortion behaviour.
2x signal input, 2x CV input. 1x signal output
3U Eurorack module, 8HP wide, 45mm deep
Current draw 20mA