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The SD2 file extension represents a Sound Designer II audio file format developed by Digidesign, commonly used in digital audio workstations. It stores high-quality sampled audio data and was widely adopted in professional music production during the 1990s. These files typically contain uncompressed PCM audio, making them suitable for precise sound editing and mixing.
An SD2 file contains audio data in 16-bit or 24-bit PCM encoding with a sample rate typically ranging from 44.1 kHz to 96 kHz. The file structure supports stereo or mono audio and includes metadata headers that describe the audio properties. Despite its age, the SD2 format is still supported by some modern audio software for archival purposes.
SD2 files were integral to early versions of Pro Tools, one of the first digital audio workstations to gain widespread popularity in recording studios. Although newer formats have largely replaced SD2, many legacy projects still use these files due to their reliable audio quality. The format is known for maintaining audio fidelity without compression artifacts.
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