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

Hi there,
I just got my XL-7 and I read thru the whole manual, but I cannot 
find a way to edit/create a drum preset.
I want to create my own drum preset where I can assign a waveform of 
my choice to every single key. I can do this with non-drum/pitched 
instruments where you can assign waveforms to each of the 4 layers, 
but how do I do this with drum-maps? This is standard on each and 
every rompler I have in my rig and I cannot believe that the XL-7 is 
not capable of this. What am I missing?
As I want to play and record drums live on the rubber-pads I need to 
assign my favorite sounds to the pads of my choice.

Holger