The Filter Factory, a famous machine known for its intense filtering capabilities. Functionality was confirmed through testing with stereo phone jacks. There was no noise or crackling in the knobs. The MIDI and CONTROLLER sections have not been tested due to a lack of equipment. It was stored mounted in a sealed transport rack, so there are no scratches on the panel. Close-up photos of any minor scratches are provided for your review. I am also listing other analog synths and vintage effects, such as the KORG G5 bass synth and the Electro-Harmonics Micro Synth. #moog #modularsynth #analogsynth #analogfilter #electrix