Acer Veriton N2620G - Manual (Page 29)

System Settings | 29
Sounds
This section allows you to adjust the master volume level for the terminal.
1 From the DeTOS Desktop, select DeTOSControl Panel.
2 Click the Sound icon on the left-hand side of the Control Panel
under System.
3 Left-click and drag the bar left or right to decrease or increase the
volume.
4 Press the Apply button to save. Your changes will take place
automatically.