I should have known that this would be to good to be true. Before I bought the DGX I was lead to believe that the UX16 USB interface would be all that is needed to connect a DGX to another keyboard with a midi-in connection or a MFC10 etc.
Anyway here's the scoop.
The UX16 USB interface will NOT convert the DGXs USB port to MIDI.
A big thank you to Steve Deming who took the time to email me and point this out.
So back to the drawing board.
Floyd