You're right about the filtering. Pat. I've tried it the past and it ain't that great.

I will sometimes double the drum track and use a low-pass filter on one track to accentuate the bass drum and a hi-pass filter on the other track to add punch to the snare and toms and eliminate as much of the kick as possible. It works pretty good.

I've tried adding a third drum track with a hi-pass for just the cymbals but there's too much overlap with the snare fo this to be really useful.