To adjust the volume using the VOL (Volume) buttons on the keyboard

Press the + button of the VOL (Volume) buttons (Parts and Controls of the Keyboard) on the keyboard to turn up the volume. Press the - button on the keyboard to turn down the volume.

Alternatively, press the VOL (Volume) buttons (Parts and Controls on the Front) on your VAIO computer to adjust the volume.

You can press one of the VOL (Volume) buttons to turn on the volume when the volume is turned off.

To turn off the volume using the muting button on the keyboard

Press(the muting button)(Parts and Controls of the Keyboard) on the keyboard to turn off the volume of the speakers and headphones.

Press the button again to turn on the volume.