Huh. Strange.
I've got a 3rd Gen iPod Touch using iOS5
I can 'buy' Tones and Ringers from the iOS iTunes store, and they'll work as anticipated and sync to my Mac's iTunes Library.
BUT. A 18 second tone I made in Garageband and exported via "Send Ringtone to iTunes" won't sync to the iPod touch.
Any idea for a work around?