.SDII File Extension
Sound Designer 2 Audio File
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What is an SDII file?
Audio file formatted with the Sound Designer II standard, a mono and stereo audio format developed by Digidesign (now Avid); stores sample rate and bit depth data in addition to the audio data itself; commonly used for transferring audio data between digital audio workstation (DAW) applications.
SDII is rarely used for Sound Designer II audio files. Use the .SD2 extension instead.