so, if you don't want any id3 info, you can replace those lines (your bold ones) with
%s%ac%fn ; this displays the filename
%s%ac%d1 ; current folder (for me this is the album)
%s%ac%d2 ; one folder up (for me it's artist)
the other tags with the ? and the <> in the original wps aren't needed here, thats a conditional (if something, then do this, else that)
You can try everything with the wps code, there is no way to harm your player, the worse case is that nothing is displayed.
It's a little bit confusing at first with all the % signs, I know.