here is a thread about the presence and removal of APE tags
This will make sure you can at least see all possible tags regardless of the format.
mp3tag won’t do anything unless you tell it to. If you want to clean them up and use a single type like in my example, follow the steps outlined in the post linked above.
As always, I strongly recommend you test this on a few files first to confirm you get the expected results. And in all cases when running any action on a large batch, have a backup, and maybe a second one.
thank you. i think i basically did all that following Motley's screenshot