I remember on my treo 680 I had a app calld RingoPro where you could use your mp3's as ringtones.I cant even figure out how to use my ringtone or where there at? Is there a way to set ringtones?
Ringtones are set within "Settings -> Sounds and Notifications -> Notifications Tab." If you want to manage ringtones easily, my favorite is probably going to be yours too: Ringo for Windows Mobile.