This unit came with a collection of musical gear I bought from a friend and I have never used it so I'm selling. It powers up but like I said I have never used it so I'm not sure if there are any issues but I would assume not. It is sold as is. Great sounding tube pre-amp and multi effects processor from late 1990s. 12AX7 tube driven preamp. S-Disc processing. 19" rack mount. Mono/Stereo, Midi Compression, Distortion Reverb(s) including Reverse Delay(s) Chrous, Flanger, Phaser, Tremolo, Auto Panner, Pitch Shift, Wah, Whammy, Detune, Phase Invertor, Ducker....