[[File:cgs_vca.gif|thumb|left|102px|Panel artwork. Click through for larger version. Print at 200 DPI.]]
The '''CGS mixer and VCA''' module is the combination of two sub modules, a mixer and a voltage controlled amplifier
. For the construction details of the mixer, see the [[CGS DC mixer (previous version)]]. In this case, only two inputs are used, and there is no overal gain control. The output is fed both to the output socket and the switched input of the the VCA signal input (normalised connection).
The VCA itself is the VCA/Ring Modulator from the [[ETI International 4600|International 4600 (Maplin 4600)]].