M4R
Change a file from M4A to M4R? Can you do it?
Easily and fastly convert m4a files to m4r for iPhone, free download supported for windows users
Here is the detailed directions for iPhone lovers to change m4a format to m4r with this magic m4a to m4r converter software!
Firstly, Plug iPhone to PC.
Secondly, Free download M4A to M4R Converter, launch it, run it.
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Thirdly, Click "PC to iPhone" button to create m4r iPhone ringtone from M4A audio tracks.
Forthly, This is file adding window. Here you can click "Add File" button to choose files into the converter.
Fifthly, See the two triangle sliders which you can drag to reset the start time and end time so that you can just convert the right clip you want to set as iPhone ringtone.
Sixthly, Choose Local Folder and then click "Import" to start the conversion.
Finally this M4A to M4R Converter can also transfer created ringtones to your iPhone without iTunes.