Epu- you make a good point with regards to adding the bass&drums and session expansion boards to a JV/XP synthe.

But I must confess that the XV's do have a fuller sound to them than the older JV's- most probably due to the improved D/A convertors. Yes and 128 notes of polyphony means that I'll still have a respectable amount of polphony even with 4 stereo oscillators stacked up!