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Key Features
The Doepfer A-132-4 is a quad exponential VCA and mixer. It offers a pared-down setup, only having audio in/outs and control voltage inputs. But this allows it to fit in four VCAs to a super compact space. Each of the four VCAs has two control voltage inputs (VCA 4 has only one but can have two if you don't need the sum output), a signal input, and a signal output.
The output on the bottom left takes the sum of all outputs together, which can be altered using internal jumper switches. In this way it can be used as a simple mixer. The entire configuration can also be changed via an internal jumper switch, normalling them to each other if desired.
Product Ref: 220558
If you have lots of inputs that all need separate amplitude control, this module might be useful. It takes away some of the extra controls you might have on a VCA for increasing the number of VCAs it offers. This might be especially useful if you are making a drum synth, where there'll be lots of different sounds to trigger, but you might not want to use up too much space.