I'm trying to make a ringtone for my Iphone 4. A part in the instructions says to change the format of the song..originally a m4a into a m4r...it says to go in and uncheck the box that says hide extensions. i did all that, applied the new setting, and it's still not changing into a m4r. idk what to do? Is there an easier way to get ringtones from Itunes?