Synthesized surround sound processor, Cosmetics Very good. Two channels: Front - synthesized frequency (LEDs 30,40,50,60 Hz). 30 and 40 Hz cut switches. Tape Monitor switch. Bypass switch. Surround Mode selector (simulated stereo, studio, theater, stadium). Synth level, balance, master volume controls. This machine also does Vocal elimination in studio mode of operation... THERE ARE OTHER PRODUCTS AVAILABLE THAT CAN DO THESE SIMILAR FUNCTIONS. call for more info.