For a second there, I thought that you might be onto something. I pulled up an open slot on the X-keys and programmed the Ctrl+D command into it. Then I tried it in N6 and it actually duplicated the track! But When I relocated Ctrl+Z in a different slot, it did not Undo the duplicated track (sigh). I tried clearing the original locations (saving the cleared status) and then re-programmed the commands. Still no joy.
Somebody on gearslutz said that they changed something in the preferences section to get their X-keys to work. But I can’t imagine what there would be to change/ This is NOT a MIDI device. It just records key strokes from a QWERTY KB. Do you have any idea what they were referring to?