Used, all knobs and parameters function as intended. Just don’t use it much. MIDI quirk where having the 1 lever up puts it on channel 2 (2 puts it on 3, and so on), but one can easily work around that in the DAW; just set the channel to 2 in the computer, and play away! You could also connect it straight to a keyboard and it’d work just fine. Sounds just like a real Pro One! Really cool synth. Comes in box.