Rikki,
I'm just being nosey. If your clavinova has XG and inputs, why are you trying to go the software route to play the XG voices? Why not MIDI up OMB/computer with your Clavinova? You wouldn't have to tweak the drums, or the styles at all. It would play correctly, right out of the box.
I would expect XG light on the DG305 to be similar to the Clavinova.
Starkeeper