Available as an assembled Module and as a DIY project.
No info about availability.
“This module combines a Voltage Controlled Amplifier (VCA) with a three input mixer. Typically, the output of an Envelope Generator (EG) is connected to a VC input with a signal connected to a signal input. The output amplitude of this signal is controlled by the voltage at the VC input."
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These merchants probably sell this module. Huh?
Steiner Ingebretsen kit