Power Computing PowerCenter PRO User Manual page 57

Connecting Peripheral Devices
To check or adjust the internal speaker or sound out settings, open the
Monitors and Sound control panel and select the Sound button at the top
of the dialog box, then view or adjust the appropriate control.
If you want to turn off the sound to the internal speaker, select the M u t e
check box in the Computer Speaker Volume control.
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PowerCenter Pro User's Guide
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