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

Hello!
I'm trying to use the xl7 as an on-the-go composition tool. It seems 
that I'll compose something and save it and when I go on to record 
another song, all of the sounds from the new song have also been 
changed on the first song. Get all that? How do I set up the unit so 
that each song has independently assigned sounds? I'm finding the 
manual to be of little help.

Thanks!