On your Android's SD Card place the audio file in either the /notifications directory or the /media/audio/nofications directory and the audio should show up under notification ringtones.
answered Feb 21 '12 at 02:32
Make a folder on your sdcard named 'notifications' and it should appear as an option
(a reboot might be required to make it scan the sdcard for media again)
answered Feb 21 '12 at 18:56