Hi Peter, just to update you on my problem.
I was reluctant to connect my iPad to my laptop again to locate all my missing tracks so what I done in the end was to transfer all my tracks into Dropbox on my laptop and reload them back into my Stagetraxx playlists via local files (Dropbox).
I note your comment and link regarding syncing with iTunes but the thing I can’t understand is why I lost all my iPad tracks on this occasion and never lost them on any previous occasion when I connected both devices.
Thanks for your help.