has anyone here done this before? essentially have the normal L+R mix, but also have a L+R in the rear. (of course subwoofers where appropriate too) I imagine the easiest way to do this would be with a mixer with 4+ submix outputs -- one for each corner / speaker -- and route each channel where it should sit. Or it could be done with a few Aux channels. i think this would be a bit tougher since I like the feel of faders. and if so, how would you arrange things?? it's fun to think about different styles of music and "where" you'd put the different instruments/vocals/effects/etc. !! THOUGHTS??