Hey! I had the same problem a while ago when it came to using '+' for notes, as it just made the singer say u:. I think TuneLab doesn't have the option to use '+' for notes. Using '-' may be a decent option (well, for me, at least). I know this isn't the most helpful, and I know there are other ways to achieve a similar effect to '+' notes, but this is what I do when trying to carry multi-syllable words in TuneLab.