Plex dance won’t remove play history or star ratings.
Dance will remove custom tags. I’m not sure on loudness but certainly worth a try on one album and see if it does.
Also think loudness is stored in the blogs db so (in theory) you could delete that db which will nuke it all. DB should be created again afterwards and maintenence will recreate over time. You would also lose intro detection as that’s stored there so proceed with caution and have backups just incase.
