Apple AppleVision monitors (OS 7.1) - Manual (Page 23)

Adjusting AppleVision speaker volume
If you have an AV-model AppleVision monitor, follow these steps to adjust the
speaker volume:
1 Open the Monitors & Sound control panel, then click the Monitor Sound button.
2 Adjust the volume, treble, and bass settings by moving the sliders.
3 If you want to silence the speakers and other devices attached to the monitor, click the
Mute Monitor Sound box.
Note: The maximum volume of the monitor’s speakers is limited by the
current Sound Out Level for your computer, or the volume of the device you
have attached to the monitor’s sound input port.
23 Sound Settings