Sony PCG-VX89P - Manual (Page 116)

VAIO Computer Quick Start
116
2 In the Volume Control column, move the slider up to increase the
volume. If Mute all is selected, click the check box to cancel it.
❑ You can also press Fn+F4 to increase the volume. If you double-click the
Volume icon
on the Windows® taskbar, you can view your changes on
the Volume Control window.
✍
Unlike the Volume icon , the volume dial control adjusts only the sound level from
the speakers or headphones.
✍
The Volume icon and Fn+F4 shortcuts will work only when the volume dial control
is set to an audible level.