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

Wassup yall I bought my XL-7 its being shipped and Im new 2 
synthesizers and shyt..I read tha manual in erthang but I was 
wonderin:

-I ordered an XL-1 but it comes with tha MoPhatt sound rom since I 
guess the manufacturer swapped it cuz it will sell tha rest of the 
units will it come with the 2.0 OS or I still have to upgrade it?

- What is an Arppregiator?
-What exactly does it do..?
-how is it most commonly used in musik?



the more I know of whut its used for gives me a better idea of how to 
use it.

thanx