Gigabyte GV-R455OC-1GI User Manual page 15

Configuring Audio Output
Configure the default audio output device based upon your needs.
Step 1:
Go to Start > Control Panel > Hardware and Sound > Manage audio devices.
Figure 1
Figure 3
Step 2:
In the Manage audio devices dialog box, click the Playback tab.
Figure 2
Using the picture to the left as the example, to set HDMI audio to be
the default Sound Playback device, select Digital Output Device
(HDMI). Otherwise, select Digital Output Device (SPDIF), which
is the onboard audio controller.
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