I recently used my vf80 to record drums. Because it records only 2 tracks at a time, I had to put my mics into a mixer, then get a balance between the mics and send the stereo out to the vf80. I used 4 mics on the drums: kick, snare, and two overheads. The results were OK, but I should have spent more time getting just the right levels between the 4 mics. The downside of this is that once you commit to a drum mix, you can't change it later, e.g., put in more kick only.
Anyway, unless you just record drums with only 2 mics, you'll need a mixer of some sort to combine mulitple mics and mix down to only 2 tracks.