A followup twist:
If I re-rip the audio CD that was created with normalized volume (using
MusicMatch, where I keep my complete CD database), so that it creates a new set of .mp3 files, and then use those with
Nero to burn a new audio CD without specifying normalization, it *still* won't play on the carousel.
It looks as though, when it does the normalizing, Nero puts something into the audio CD file data that the carousel doesn't grok, and this is preserved through the conversion into MP3 and back to standard .cda again.
It's bizarre ...