SPDIF (Digital Audio) ControlsIf your system supports SPDIF (Digital Audio), there will be an Advanced Controls button under the Master volume control. This button will display the SPDIF controls.
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AC3Check this box if you have a digital receiver that accepts DVD audio.
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PCM Check this box if you want all computer sounds and music, such as WAV files, MP3, CD, and game audio, to play out of your digital speakers.
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