Your files are tagged badly. You may want to use tools like
MusicBrainz Picard to fix the ID3 tags.
Part/Position refers to the
"medium index", i.e. the CD number.
Track/Position refers to the
"track number". The latter is undefined in the ID3 tags at hand and so
{pi} does not work for this file:
Properties: Select all
Title : All Of Your Weapons - Sultan + Shepard VIP Mix
Album : Echoes Of Life: Day
Album/Performer : Sultan + Shepard
Part/Position : 1
Part/Position_Total : 1
You can access the
Part/Position property in your format directly like so:
viewtopic.php?t=4285
You will likely want to process both correctly tagged files and incorrectly tagged files
(i.e. use Track/Position if possible; otherwise use Part/Position instead) which can be done like so:
or this if you want to keep both CD and track number where both are available:
viewtopic.php?t=1895