Everything is fine with the guest appearances now (thanks for your help again), but I don't know how to make it show me who the remix artist is after the song title, e.g. "Lato (Pocałuj Mnie) (Mandee Remix)", it still shows despite different combinations in tag mapping "Lato (Pocałuj Mnie)". Sorry, but I don't think I can master foobar enough to fix this myself. Thanks in advance for your help.
Try this
Make new tag mapping
Remixer
$flatten($multi_if($any($multi_strcmp($sextend(%<<TRACK_CREDITS_SHORT_ROLES>>%,%<<RELEASE_CREDITS_SHORT_ROLES>>%),'Remix')),$multi_if($put(aj,$sextend(%<<TRACK_CREDITS_ARTISTS_JOIN>>%,%<<RELEASE_CREDITS_ARTISTS_JOIN>>%)),$joinnames($put(an,$sextend(%<<TRACK_CREDITS_ARTISTS_NAME>>%,%<<RELEASE_CREDITS_ARTISTS_NAME>>%)),$get(aj)),$get(an)),))
and after that you could use this to add it to the title
%title%[' ('%remixer%' Remix)']
Note that the trick is changing the text between '' after the second %<<RELEASE_CREDITS_SHORT_ROLES>>% for the text that foobar use.
You can see them with
Track credits
DISCOGS_TRACK_CREDITS
$zip($join(%<<TRACK_CREDITS_ROLES>>%),' - ',$join(%<<TRACK_CREDITS_ARTISTS_NAME>>%))
Release credits
DISCOGS_RELEASE_CREDITS
$zip($join(%<<RELEASE_CREDITS_ROLES>>%),' - ',$join(%<<RELEASE_CREDITS_ARTISTS_NAME>>%))
You get something like that
DISCOGS_TRACK_CREDITS
Lyrics By - Tharen
DISCOGS_RELEASE_CREDITS
Music By, Vocals - Tharen; Painting [Credits Page] - Sophie Lemoine; Programmed By [Keyboard Programming] - Tharen; Recorded By, Mixed By - Georg Hrauda, Tharen; Vocals - Elisabeth Toriser
To extract the vocals for example use 'Vocals' in a new tag mapping
VOCALS
$flatten($multi_if($any($multi_strcmp($sextend(%<<TRACK_CREDITS_SHORT_ROLES>>%,%<<RELEASE_CREDITS_SHORT_ROLES>>%),'Vocals')),$multi_if($put(aj,$sextend(%<<TRACK_CREDITS_ARTISTS_JOIN>>%,%<<RELEASE_CREDITS_ARTISTS_JOIN>>%)),$joinnames($put(an,$sextend(%<<TRACK_CREDITS_ARTISTS_NAME>>%,%<<RELEASE_CREDITS_ARTISTS_NAME>>%)),$get(aj)),$get(an)),))
and you will get
VOCALS
Tharen; Elisabeth Toriser
Hope that this help
Is a bit tricky at first but when you start to get the dinamic is very powerful