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

Hi, I don't have an XL-7. I would like to know is this possible:

Create a song with many different sections (A B C etc), and have the 
ability to change to any A B C etc. section. I would like to be able 
to change sections by a midi command, such as from my foot 
controller, typically a patch change or CC# message, or even note-on.

If so, how many sections can be created? 16? Or would one create 
each section as a seperate pattern (one of the 512 memories?)

Thanks very much,
Eric