I have been using an onkyo 575x for several years. While watching digital cable I have noticed that the front always displays "Pro Logic" instead of the normal "5 Ch Stereo". First of all, what is the difference? Which is better? I realize "better" may be subjective, just talking in general. The only thing I can think of is that my mother-in-law was at the house recently alone watching tv (and taking care of our 3 month old). Anyway, I mentioned to the wife to ask her mom if she had touched any settings but she said she had not. So could something have changed with COmcast that would have changed the signal to Pro Logic? Or is it definately a setting? I haven't found my manual as of yet and I wanted to ask here.