BSS AC-5S Wall Mount Controller for Soundweb London Systems (Black)The Soundweb Contrio AC 5S are simple analog wall controllers designed for use with BSS Audio Soundweb London devices. Available in black or white, and in single gang US Decora form factor. The 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 GPX contains 36 GPI. The AC 5S contains a single five position