So I was using an Arturia Keylab 61 Essential as a second keyboard (MIDI controller) with my Hammond SK1-73 which worked okay (not real thrilled with the keyboard), but I dropped it and broke one of the keys. So I ordered a M-Audio Keystation 61 Mk3 because of the semi-weighted keys, but I cannot get it to work with the Hammond. When I talked to Sweetwater, they said (after extensive tweaking of MIDI, and research) that the M-audio is probably not a "stand alone" keyboard, and has to be played through a computer, as opposed to the Arturia. So I have two questions for you all. (1) Has anyone got a M-audio keyboard to work as a second manual with a Hammond clonewheel? (2) what is a good inexpensive MIDI controller to use as a second manual with a Hammond clonewheel? Thanks!