unit powers on, and works. has a couple of knobs missing, but doesn't affect performance. The Pyle 19'' Rack Mount 4CH Professional Mixer with SFX and Echo - Digital Echo w/ Variable Delay, Repeat and Level - 8 Digital Sound Effects w/ Speed, Volume and Cue Controls - 2 Mic Inputs, Up To 8 Line Inputs - 2 Turntable Inputs w/ Ground Screw - Individual Channel Gain Controls & Cue Selectors - 3 Ba...