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no need for this app!.
This program converts your aac files into m4r files. There is absolutely no need for that. You can use any audio editing program to create a ringtone for iPhone. Simply choose a song, cut the desired part of it (max. 35 seconds) and save it as aac (aac=m4a !!!!). Then simply rename the extension from m4a (or aac) to m4r. That's it!!! Here is your ringtone for iPhone.