Does anyone have experience with a receivers Matrix 6.1 output, where the receiver creates a virtual rear surround sound based on the EX signal? Is the quality and experience equal or better than 5.1 sound? And does anyone know a site that has a list of movies that have EX soundtracks, since I seem to remember hearing that many DVDs include the 6.1 track but don't list it on the package. I just picked up a new Yamaha receiver (after my Sony blew the rear channel) and it supports Matrix 6.1 (along with lots of other stuff). Can't wait to get it all hooked up, esp if I can do the Matrix 6.1.