This module provides two handy voltage controlled amplifiers in 6HP. Both channels are linear, DC coupled VCAs, suitable for both audio and CV processing.
The control inputs have dedicated attenuators, and each VCA can be manually opened with the Bias control. Finally, the module has a built-in mixer, which sums the output of both VCAs and one extra auxiliary input into the Sum Out jack. This allows, for example, multiple units to be daisy-chained to form a multichannel voltage controlled mixer.
The circuit is built around the AS3360 dual VCA chip, which is a clone of the classic CEM3360. This chip is easy to obtain, reasonably priced and has a good performance. The rest of the circuit is implemented with 0805 SMD parts.