I think I mentioned this above, but "Dolby Surround Sound" does not guarantee 6 (5 speakers plus .1 LFE) discrete channels going to your 1050. The Dolby standard, if I'm remembering correctly, says "up to 5" regular channels of information plus the LFE channel. There is a mode called "Dolby Stereo."

It comes down to the signal going to your 1050. If you're in "Surround Mode", no matter how you get there, if the information is a stereo stream, then ProLogic is going to turn on. There's also a ProLogic stereo mode. Check the Dolby website for more information on this process.

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But in some cases where the program is shown to be in Dolby SurroundSound, BOTH the 5.1 AND the ProLogic comes up.

This means that it's being broadcast to you in some form of stereo and your 1050, using ProLogic, is making it into 5.1 surround sound.

Have fun!