I think the easiest way to look at the Mediastation, is to treat it as a controller keyboard and computer, (In one box) therefore what sounds you get out, will be totally dependent on what instruments THE USER loads in. (Like virtually all computers it has its own internal sounds, but whether you use them or not, is down to user preference)
If you look at it from this point of view, it should make it easier to understand.
Hope this helps.

Bill