Yamaha DTXpress/DTXplorer/DTXtreme

I was fiddling with my week-old kit last night and came 
across an interesting problem.  I was trying to get 
different snare sounds for the main pad and rim 2; for 
example, a maple snare with a blue90 rim (not exactly what I 
was after, but you get the idea).  Anyway, after I had set 
up the rim to the sound I liked, I started trying out 
different snares.  The problem was, everytime I switched the 
snare, the rim would change to match the snare.  So, if I 
changed the snare to a metal snare, the pad would change to 
a 
metal rim.  Couldn't figure out why this was happening, so I 
got out of the edit mode, turned it off, and started over 
again from the beginning.  THIS time, I was able to get 
complete separation of rim / snare effects.

In the end I was able to get what I wanted, but my question 
is, what was happening that "linked" the snare/rim sounds?  
I'm sure I changed some parameter accidentally, but I'd like 
to know which one so I can avoid / use that feature in the 
future at will, rather than randomly.  Thanks...