March 28th, 2005, 07:58 PM
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 | U.S.D.A. Prime | | Join Date: Aug 2001 Location: San Antonio, Texas
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http://developer.apple.com/documenta...ection_11.html Quote:
By default, when components are plugged into the headphone jack or the rear line-out, the sound system mutes the internal speaker.
The headphones, rear line-out jack, and S/PDIF output are only muted when selected in the System Preferences. Muting and sound options are set in System Preferences:Sound:Output. Selecting the “Digital Output” checkbox allows operation of the analog and digital output ports when headphones are attached, enabling monitoring of the optical digital transport.
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