Free Custom Ringtones in iTunes 7.4 (Workaround for 7.4.1?)  —  Cleverboy posted instructions on our forums on how to “convert” AAC music files to ringtones in iTunes 7.4.  He states that ringtones and song files are only distinguished by file extension.  The file extension for Ringtones is “M4R”.

Source:   MacRumors iPhone Blog

Author:   Arn

Link:   http://www.macrumors.com/iphone/2007/09/07/free…