Mass / auto remove tags?

[obetz]

Hi, thanks for this great app!

How can I remove tags automatically from many songs?

Reason: I want to assign tags with a generator output. Previously set tags not being in the current run of the generator shall be removed.

So I either want to remove the tag from all songs before running the generator, or I want to tell the output to remove the tag from the "non output" songs. Like in the "Generated Playlists"...