BSS AC-V-WHT-US Decora Plate Analog Volume Controller (White)The Soundweb Contrio AC V is a simple analog wall controllers designed for use with BSS Audio Soundweb London devices. The AC V is designed to connect to General Purpose Inputs (GPI) (also known as "Control Inputs") found on Soundweb London devices. Most Soundweb London devices contain 12 GPI. The Soundweb London BLU GPX contains 36 GPI. The AC V contains a single 47k Ohm logarithmic potentiometer which is useful for volume control. The AC V requires