It stands for Real Tracks. Go the PG music home page, if you can, and listen to the demo's. I think they are part way down, and on the right side. I have a PC, and was not aware that Mac users did not have these features, or at least older versions don't support it. I bought this PC lap top for a little over $350.00. But the towers are sometimes even cheaper if you hit a best buy sale or something.