What is m4r?
A M4R extension is the extension given to a ringtone file, created for the iPhone by Apple Inc. Basically, a M4R file is just a M4A file that has been renamed. All music files can be converted to an iPhoe ringtone by renaming a music clip of maximum 30 second length to .M4R. Import the M4R to iTunes and sync the playlist with your iPhone.
What is ds2?
The DS2 format is an Olympus DSS Pro Audio File that is based on the Digital Speech Standard Pro format, which is a highly compressed audio format from the developers at Olympus. It is often used for the recording of human speech like notes from lawyers, physicians and researchers. Using the DSS Player Pro software, the DS2 files can easily be converted to standard WAV formats.
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