So a few questions: Is the rear center channel discrete or matrix in DD-EX and DTS-ES 6.1 tracks? This affects my main question, which follows. Say you have a 6.1 track, DTS-ES or something, but you only have a 5.1 receiver. What happens with the channel containing the rear center information. Does the 5.1 receiver read the signal and play it over both the left and right surround to create a pseudo-rearcenter or does the information contained in that signal just not get played at all? If the information does not get played, then it would be ideal to choose the DD 5.1 track if available then becuase you'd be getting all of the sound information encoded in a way setup for 5.1. Thoughts???