I guess U r using 2 much send on each fx channel... u can process, each one individually or do a few groups like hats, toms, snare, etc.. then each fx channel can b routed 2 another fx channel (just look at the bottom of the mixer, u'll find a output slot, which is normally routed 2 master).. so just do each one individually and then slap' em all together on another fx channel and compress that 1!

hope this helpz,

Z