Lynard, not sure what you're saying - but its sure to confuse the OP if he returns!
If the guy wants to record 12 separate tracks he needs an interface with 12 inputs/outputs. A mixer with the same ability would work as well. This Allen and Heath should work, I think it has individual track output via USB and it's only $700:
http://www.sweetwater.com/store/detail/ZED24/
The problem with a 'mixer' being used as an interface is all the extra electronics in there to mess up the signal.
12 mics is probably overkill for recording drums anyway, there is seldom need to put a mic on every tom.
Kick (2 if you've got double bass)
Snare
Hi Hat
2 overhead
2 room
Interfaces (or mixers) with 8 mic preamps are much easier to come by!