Asus Motherboard A8N-SLI SE - Manual (Page 118)

5-12 Chapter 5: Software support
S/PDIF option
The Sony/Philips Digital Interface (S/PDIF) options allows you to change
your S/PDIF output settings.
To set the S/PDIF options:
1. From the Realtek Audio Control Panel, click the SPDIF button.
2. Click the option buttons to change your S/PDIF out settings.
3. Click the Exit (X) button on the upper-right hand corner of the window
to exit.
To set the sound effect options:
1. From the Realtek Audio Control Panel, click the Sound Effect button.
2. Click the shortcut buttons to change the acoustic environment, adjust
the equalizer, or set the karaoke to your desired settings.
3. The audio settings take effect immediately after you click on the
buttons.
4. Click the Exit (X) button on the upper-right hand corner of the window
to exit.