When I did this I found that iStripper was removing these apparently obsolete links causing the vast majority of the tracks I was using to disappear
I routinely backup the two music files that kep track of these links.
so I can restore the files if needed.
In the Data/Musics folder are two files
musics.cache
musiclist.mpljust make an archive copy when ever you add or remove music files.
edit: File
musiclist.mpl is a manreadable text file
it's one long line of text, where the full path to each song begins with a 1 or a 0 and ends with ##
the very next song path is right after the ## with no space between.
1 = it's checked and enabled
0 = it's not checked and disabled