This basic building block of a modular system is indispensable. The Hungry Robot VCA provides 2 independent, high quality VCAs. These VCAs are DC coupled which means you can patch in audio sources as well as CV sources. As with all Hungry Robot "Modular Boxes" the VCA can be powered with a simple 9V DC, Negative Center power supply.
CV Knobs: The two knobs are attenuators for the incoming CV inputs
IN: Patch in an Audio signal or CV source.
CV: Patch in an envelope, LFO, or any CV source to provide voltage controlled amplification to the incoming source