here is the only two ways that i know of.
1. if your mixer has an output on every channel ("direct Out" or "insert") then try this..... plug each drum's mic on it's own channel. (ex: snare,kick,overhead,hi tom,mid tom and low tom.) the take a cable (1/4") and come out of each of the channel's output. here's a drawing.........
mixer_________________________________________recorder
channel__________________________________track________
kick-----direct out-----------------------------------track 1 input-------
snare----direct out----------------------------------track 2 input-------
overhead----direct out-----------------------------track 3 input
and so on...........
then select all the tracks (that have a drum channel on them) to record.
if your mixer channels don't have a direct output then do this....
if you mixer'd channels each have there own insert, then do the same thing that you would do if you had a direct out only, instead of pluging the cable in all the way, just push it tell the first black ring on the connecter goes in then leave it.
2. my recorder (fostex vf-16) has a bilt-in mixer with a direct record mode so it's easy to do it from that recorder.
hope that this helps you.....if it don't..i'm only 14.
good luck,
zeke