I realized my notification/reminders weren't working and upon investigation saw that the tones I had assigned were not on my ringtone list. So I am missing 3 default ringtones: Heaven, Guitar, Viola. All other default ringtones are accounted for! I have been trying out various calendar,notes, and to do applications. Could those ringtones have been deleted when I uninstalled any applications the ringtones were associated with? How do I get them back?