Mountable mono PA program selector and volume controller for 100 V audio systems or other audio signals. The unit selects between six signal sources and provides volume attenuation in 11 steps. It features a built-in 24 V emergency priority relay, aluminum front panel and knob, screw plug connections, and flush-mount installation. Rated power is 10 W RMS, with a frequency range of 50–18,000 Hz.