Ok so together with the guys over on the musicbrainz forum i was able to make this script to extract all artists after the 1st (main artist) and copy into Guest Artists
$setmulti(GUEST ARTIST,$rreplace(%artists%,^[^;]*;,))
$if($eq($get(GUEST ARTIST),%artist%),$set(GUEST ARTIST,),)
However in my setup there is another problem. Since i'm already entering multiple artists in Artist (for Asset UPNP) the script above effectively makes artists appear as both an Artist and Guest Artist in the multiple artist splitter.
e.g.
display artist:
Ludacris
artists:
Ludacris - Artist
Chingy - Artist
I-20 - Artist
Tity Boi - Artist
Chingy - Guest Artist
I-20 - Guest Artist
Tity Boi - Guest Artist
MusicBee doesnt seem to like this as when i set my thumbnail browser to Artist: Guest and go to any of these guest artists no tracks can be found
Strangely enough though.... some tracks with less guest artists show up fine under the respective guest artist of the thumbnail browser. Weird
I checked tag inspector for the oddball files and all seems fine. Multiple line items for TXXX\Guest Artist as expected
Is there some something in the backend that changes MusicBee's behaviour if the number of artists in Multiple Artist Splitter is greater than X?