Thank you for jumping in on this topic. I have always let the Audirvana synchronization cycle complete and I have used iTunes to delete or add tracks and Playlists which I have effectively brought over to Audirvana via the synch. I did not notice this duplication earlier because I am a playlist user, however, I did note when I added a new purchased song it appeared twice in the Newly Added Song folder in Audirvana which I had mistaken as a Cloud version (which I also would prefer not to see).
My library is not as big as yours, but, I do have have close to 5000 songs and my experience with the way iTunes handles meta data just seems more intuitive and less problematic. I really wish I can do another synchronization and have this duplicate and triplicate issue just “exit stage right” and fix itself.
Again, I appreciate the feedback, anything reasonable would help, however, at the end of the day, this issue is bad and a little hideous, I am sure we both have better things to discuss on a weekend besides the handling of meta data that the application should get right from job one, really!
In short, if Auudirvana did not sound so damn good I would definitely start thinking about alternatives. Again, folks having issues since 2017 really underscores my concern and irritation on this very basic, essential matter.