Charlie Butten, an East Coast transplant, made his way to San Francisco in the 1960's and helped revolutionize the intercom industry we know and love today. An audio genius, Charlie became well known to Rock n' Roll bands such as Cream, Carlos Santana, Canned Heat and Procol Harum. Together with Bob Cohen, the sound mixer at the famed Avalon Ballroom, Charlie developed the very first distributed amplifier intercom system consisting of a beltpack powered by a main station. Thus, the first ...