BSS AC-V-BLK-US Analog Controller With Volume (Black - US)The Soundweb Contrio AC V and AC 5S are simple analog wall controllers designed for use with BSS Audio Soundweb London devices. Both the AC V and AC 5S are available in black or white, and in single gang US Decora or single gang EU form factor. The AC V and AC 5S are 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