Emu XL-7 & MP-7 User's Group

I am about to order an EMU E5000 Ultra and, before I do, I have a 
quick question for any EMU EOS sampler owners.  What exactly defines 
a part?  The E5000 is 16-part multi-timbral.  Does this mean that a 
drum kit, for instance, could be considered as one part? 

Biomech

PS I also posted this in the E5000 group, but I need a quick answer 
and the XL group is more active.