- Extension
- .m4r
- .sd2
- Format
- Binary
- Binary
- Category
- Audio
- Audio
- Developer
- Apple Inc.
- Avid Technology
- Description
- M4R is an iTunes ringtone file that stores mono channel audio. They are identical to the M4A format files only that they are correctly used for ringtones.
- The Sound Designer II file, with the extension .sd2, is an audio file format that was originally developed by Digidesign for their digital audio workstation software, specifically for use in professional recording and editing environments. The format was widely used for its high-quality audio data storage and was particularly popular in the late 80s and 90s. It supports multiple audio channels and bit depths, making it versatile for various audio production tasks.
- MIME Type
- audio/x-m4r
- audio/x-sd2
