I know how to convert mp3s to m4a, then rename to a m4p to add ringtones to my iphone.... i'm wanting a ringtone that is the high pitch that is extremely aggravating (to those who can hear it) and i found an mp3 file of it, called mosquito, or something, and the mp3 plays just fine in itunes, but, when i convert it to AAC in itunes, the result file does not play a sound. i'm 23 years old, so i shoudl be able to hear it. any advice? or does anyone have an m4r file of a ringtone they can email me? thanks!!