Just bought one of these on the advice of my teacher. It has 3 metal plates that are interchangeable. Any ideas which are the best and why they are different? Not had a chance to take it out of the box yet!

I have one for sax and am considering getting one for my clarinet as well. If you open the box there is a piece of paper saying which does which, they each have benefits depending on which style of music you are playing.

Just found out how to change the plates. I like it better than the one I had. I might get one for the Eb when I'm rich!