I am a little confused about usage rights when it comes to royalty free audio tracks. Can someone shed some light on this please? The rules are very confusing.
It would if you shared what you've heard so that we can verify if the rules apply across the board? From what I have read, once you pay a one-time fee, you obtain the legal right to use a composer's music in commercial or personal projects.
Usage rights vary from one website to another. There are some that give you unlimited usage, while others give you a limited number of uses. It is confusing indeed. I think the best thing to do is to check their fine print.