The touch sensors and "volume" button is on the top right corner of the keyboard panel .... above the keyboard keys.
press "1" - left most - to mute and unmute
press "2" - next - going right - to turn volume down
press "3" - next - going right - to turn volume up
or ..
you can press (at the same time) the Fn key and Esc (to mute),
Fn key and F1 to decrease the volume, or
Fn key and F2 to increase the volume.
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