Populate album artist with artist info, only when empty

[ohrenkino]

Have a look at this thread:
have a look at this thread:

IF "Albumartist" IS "", "Albumartist" = "Artist"

Hi! Is there any way to name the TAG "Albumartist" the same as the TAG "Artist" only IF the TAG "Albumartist" is empty? I'm on a death end since the REGEX action doesnt work with other tags outside of the one you are working with..or at least i think it doesnt Thanks once again for your time!