Lee Schlund incorporated a 6710 Vocoder and 7700 power supply in a two-space rack chassis (1990). The 7700 board is mounted to the rear panel of the chassis and a blank front-panel below the vocoder panel holds the power switch and a power indicator LED. The front-panel connectors are duplicated on the rear of the chassis. Bias (control) voltage connections and controls are accessible through hole plugs. Power supply outputs are made available on positive and negative connectors (mini-phone).