Pro Logic IIx is the one that I'm using more and more to make use of all my 7.1 setup.

http://www.dolby.com/consumer/technology/prologic_IIx.html


M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85