Dom,
OK, let's go here...now this is my question...is MS an arranger or not?

If it is, then why do I need Live-Styler?
What style fromats do you support? Yamaha?, Korg, Roland, Ketron etc???
We are now talking about the real reasons the SW arranger is not quite there yet! MS is no different as far as I know.

If you only support your own style format...your in trouble. It take TONS of talent to make styles that are good. Thousands of $$$. To support Yamaha styles is your best bet today.
Wersi was very smart to license Yamaha style playing on the OAS system.

As to LS, the 8 tracks you see are for RH and LH sounds. You also have all the style tracks in addition. 8 tracks is more than any HW arranger I know of?

As to Yamaha XG...make a XG sound set from the quaity Giga (or other) sound sets. Put in Megs conversion, meaning if a mega voice is in a style...convert it to the next best non-mega sound )LS does that today). Eventually make your own mega sounds for MS. Not really that difficult for the right person (hire it done?).

The style issue is huge...IMHO to be really successful in the arranger word you will need to solve it. Most of us do not have the talent or time to be making a lot of our own styles for MS. Now & then we like to make a special one. It takes lots of hours.

Lee