Rakly3
So I figured something out that explains my earlier confusion. I vaguely recalled that some videos didn't have the DirectShow option in the settings and that seemed to make the difference as far as audio working for the SLR originals.
Then I tried another SLR original. The audio didn't work, and the direct show option wasn't there. I realized that the file I tested after your recommendations had the "FB360" suffix removed as part of my attempts to get audio working. With "FB360" appended to the title, the Direct Show option isn't there in the SLR player. Once I removed "FB360" from the titles of all my videos and enabled direct show on each video in SLR, I have no issues at all.