Board Thread:News and Announcements/@comment-27190591-20161127160503/@comment-27190591-20171118183833

Both. Adding the same track multiple times in the software means that the software will export this track for multiple times resulting in the error you've got.

I guess the problem you have is because there's a bug in the filtering system. You can mix the regions up like you've written, but the Music Pack Creator doesn't show the right tracks if you filter them.

But it also could be a bug with the LOTR Mod if you export the Music Pack Project and in the MC world the music plays at the wrong places. I suggest to to try this out; within the next days I'll provide a patch for the Music Pack Creator so that the filters work correct again.