Apple AppleVision monitors (OS 7.1) - Manual (Page 17)

To select a sound output device, follow these steps:
1 Open the Monitors & Sound control panel, then click the Sound button.
2 If necessary, select a Sound Output device.
For most computers, Sound Output is automatically set to “Built-in” and no
selection is necessary. If you have a third-party sound device attached to your
computer, there may be additional choices available. Select “Built-in” to use
the speakers on your AppleVision monitor.
Note: Some third-party devices may not be available through the Monitors &
Sound control panel. Use the Sound control panel, installed in the
AppleVision Extras folder in the Apple Extras folder, to configure these
devices.
17 Sound Settings
Adjust these
settings.
Confirm this says
“Built-in”.
Select a quality
setting.
Select the port
the monitor
sound cable is
connected to.