Ah could be, I don't have the CD handy, but the haunting melody of 'Inner Space' really sticks out in my mind over Beach of the Void. It's just somber and spooky, and further is by your side while you're playing the game rather than when you're watching the endless cut scenes.
I guess this is as good a place to ask as any: When in the HECK are they releasing the Xenosaga Episode II OST? I can't find it anywhere.
edit: As far as the mix goes, I think I liked the original themes better. They're spooky and slow and better that way. This feels a bit over the top throughout, though it seems skillfully assembled.