Yamaha DTXpress/DTXplorer/DTXtreme

Hey all,

I've scoured my DTX2 manual and the message boards, and can't find 
the answer to this.  I have recorded a pad song that uses congas and 
other assorted percussion, however, when I switch to a different kit, 
I lose the original sounds and only get the sounds that are assigned 
to that kit. So I am getting playback of the song, but not with the 
sounds I want(I'm not getting the piano sounds that others have had 
trouble with, its just that my congas turn to toms or whatever is 
assigned to that kit). Can I do what I'm trying to, or is it beyond 
the capabilities of the DTX2?  I'm hoping the limitation is my brain 
and not the DTX2's. I am a new owner, and love the set, but it is a 
bit frustrating. Any help is really appreciated!

Raven