Making it through THE MUSIC MAN. So fun to watch this on Blu-ray, though I always have issues with repurposed HD 5.1 mixes--the source elements just don't support the effort a lot of the time.
Even though I don't own a BD player, I've always wondered about those audio features which "enhance" the original audio "layout". Is it just a matter of making sure that all the fill speakers are used during playback?
I'm not quite sure what you're asking but if you mean, do repurposed 5.1 tracks utilize surround channels, the answer is yes, depending.

For something like THE MUSIC MAN, occasional foley and ambient effects will spill into the surrounds, and the music typically does as well. What I was actually referring to aside from channel usage is the "sound" of the stems, which simply aren't as clear as today's tracks are (to state the obvious). There's always a certain "boxiness" that attends some of these older tracks, especially musicals. Sometimes I just wish we had the original tracks and didn't worry so much about "upgrading."