How to convert a batch of MP3's in Apple Music to AAC, then automatically delete the old MP3s? I would like to convert a large number of MP3's in my Apple Music library to AAC (to save disk space).
Using the Music app, I have tried it with all songs of an album. Now, I've got each track twice, once in MP3, and again in AAC. That's very cumbersome to go through all songs and find the old mp3's.

Is there an easier way?

(I have googled, but did not find anything really useful.)

I converted the tracks as follows: I went to the album, selected all tracks in it, went to File  / Convert / Create AAC Version, and let Apple Music do the conversion.
That worked, but, as I said, afterwards, each track was duplicate in the album.
There is a free app called Adapter that will do batch convert but I'm not sure about the deletes. Since it's free it's worth a try. If it doesn't do the deletes you can always sort the files by kind so that all mp3s will be listed together in the Finder window.  Adapter also converts images and movies as well as sound files.