GameCom 780/788: How to Activate Surround Sound
How do I activate the Dolby Surround Sound function on my GameCom 780/788 headset?
If the headset icon in your system tray appears as follows, then the Surround Sound feature is disabled:
To enable it, right-click the icon, point to Dolby, and then click Enable. The headset icon should now appear as follows:
Note: This icon will disappear from the system tray if you unplug the headset. It will reappear when you plug it back in.