Multi-tag with custom tag behaviour

[simbun]

(26-06-2022 23:10)JoaBack Wrote:  It worked when I did the tagging in mp3tag but not in fb2k, apparently.
.flac files, some .mp3.

In foobar there's a configuration option to specify which tags support multi value fields, have you added Format to that? If not go to 'File > Preferences > Advanced' and then in the Filter field on the top right of the window type 'Multivalue fields' (Advanced > Display > Properties via the Menu system) and append your tag to the end of the list, delimiting it with a semi-colon.

The only other obvious difference between the two tag programs is that mp3tag uses '\\' as its delimter whereas foobar uses ';'.
NOTE: These are only used for display purposes, the actual delimiters used will vary depending upon what format you're writing to.

Get it working with FLAC first as mp3tag uses a non-standard delimiter in ID3v2.3 which will confuse things further (MinimServer recommends ID3v2.4).