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PowerDVD/CLMEI/ProLogic question

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I have a very good, very fast computer with a 5.1 sound card and a
Logitech 5.1 speaker system. I have PowerDVD 5, which can of course
decode either Dolby Digital or DTS.

My question has to do with the audio configuration menu, where I have
the option to use an audio channel expander--either CLMEI or Dolby Pro
Logic II, in either "Movie" or "Music" mode.

From what I've read about these, it's not clear whether you're just
supposed to use them if you only have a 2-speaker system to simulate
surround, or if you're supposed to use them to simulate surround when
you're playing something with only 2 or 1 audio channels over a
surround speaker setup, or if you use them even *with* a 5.1-encoded
movie on a 5.1 system to "improve" the surround effects.

Does using these expanders when you have a surround sound system
distort the sound so you're not getting the full benefit of the
experience? Which one should I use? And if I should or should not
use an expander for playing Dolby 5.1, should I then do the same for

I'd really appreciate if folks could help clear up my confusion.
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