Single VCA with dual CV inputs

This is a single-channel VCA based on a THAT2180 chip. It's ultra clean and sounds fantastic. It's a perfect sonic companion to our MIX and it's also an ideal final output module.

The VCA has a manual gain control (offset) and two independent CV inputs, both with an exponential (audio) response curve. They are configured to take 0-5V CV signals which will open the VCA fully to unity gain. CV inputs above +5V are diode-limited, a feature which can be exploited to change the effective curve of an envelope signal (similar to a "hold" stage in an AHDSR envelope).