I totally agree with Phil. Some years ago I owned a DM5 drum module and, to what I can remember, usually the last three trigger inputs (10, 11 & 12) were factory assigned to some percussion sounds on most kits.
Now, if you use a 'regular' 5-piece drumset with cymbals, use the second output from your dual zone snare pad (the rim) to plug input 11 or 12 and - maybe using "note chase' on - find that input and change it to the sound you want.
I usually left input 10 for the ride bell sound and 11 for a fourth tom pad, so 12 is perfect for the snare rim...
Or expand your inputs with any external midi trigger i/o device...