I think the answer, to some extent, lies further back in the chain - when you are putting together the arrangement. If you get too many instruments playing at the same time in the same octave, no amount of EQ is going to put that right.

If you give each instrument space in which to work, you'll get a much smoother frequency spectrum and the mix will need less processing. I appreciate that it's not always easy with realtracks - you can't ask the guitarist to play inversions higher up the neck for example, but MIDI tracks can be manipulated to good effect.

I still remember the engineer from whom I learnt such a lot some forty years ago saying - "Every time you reach for the EQ when mixing, it means you got something wrong when tracking". A bit harsh, maybe, but you can see his point.

ROG.