New and used. The Extron VC 50 is a one-gang wall mounting kit designed to provide remote volume control of select Extron power amplifiers or preamplifiers with a remote volume control port. The integrated volume control knob does not require soldering. Captive screw connectors on the back panel provide quick and easy connectivity. The rotary volume control provides easy adjustment and ensures precise volume levels. The VC 50 includes black and white high-impact plastic faceplates and a one-gang mud ring kit.