"Guess Tags" is working poorly for me.  At present, I have 1191 WAV files, 454
MP3 files, 70 FLAC files and 4 WMA files.  Generally these are stored as
ARTIST\ALBUM\TRACKNUM TITLE.  The WAV files were tagged by EAC, and the FLAC
files by FLAC Front End.  My music library is \\servername\Music.

I have a few untagged WAV files that are songs by some friends of mine, and I
can't get SlimServer to get the names right. Those files are missing TRACKNUM,
but a line in my Guess Tags format handles that (ARTIST\ALBUM\TITLE).  The
problem is that Slimserver is treating "servername" as the artist name and
"Music" as the album name.  This means that all tracks have the actual artist
name for the title.  (In fact, I have also found that stray MP3s that lack
artist or album tags being treated the same way.)

Shouldn't SlimServer look at the entire file name (e.g.
\\servername\Music\Beatles\Help\Another Girl.wav) and start from the end and
work backward?  At any rate, it should ignore the music library path if it's at
the beginning of the file name.

I tried JJZolx' suggestion of prepending my "Guess Tags" formats with two
placeholders (e.g. "CT\GENRE\") to trick SlimServer into thinking that
"servername" should be interpreted as content type, and "Music" should be
interpreted as Genre, but that screwed up my entire library; I had fewer than
half the songs as before, and my friends' songs (via browse by Artist) showed up
as "0 albums with 4 songs by 1 artist", which is the right number of songs, but
they were inaccessible.  Further investigation showed other artists with the
right number of songs, but the wrong number of albums.  Songs on missing albums
were inaccessible.  My guess is that the total number of songs reported was the
sum of those on accessible albums.  The big question is, why is SlimServer
bothering with the Guess Tags formats for tagged music?