which inputs are best suited to bass drums?

I have two bass drums on my kit and wondering which inputs are best suited for bass drums on a 56 input MD with positional sensing, obviously I won't need positional sensing on the bass drums.
MegaDrum Forums
http://wap.megadrum.info/forums/
On the back (from left to right looking from the back) top row:
1. HiHat pedal/controller input
2. Kick
3. HiHat
4. Snare
5. Ride
6. Crash
7. Tom1
8. Tom2
9. Tom3
10. Tom4
11. Aux1
12. Aux2
13. Aux3
14. Aux4
15. Aux5
16. Aux6
17. Aux7