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

Hi,  

so I have been spending some time with my XL rack and I am starting to 
the get the hang of some of the ins and outs but I am lost on one 
thing...

I wrote a pattern in MPC using the xl as the tone generator, made many 
changes to the midi chan and the volumes in the mixer section as well 
as selected different patches for all the different midi channels - 
when I was done for the day I turned off the unit.

I came back today and found that all my changes that I spent all that 
time doing were no longer there. I saved all settings in the mpc, but 
did not save anything on the XLrack, do I need to?  if so, how? 

what did I do wrong or what did I miss?

please help.
Aaron