Asus P5K Premium/WiFi-AP - Manual (Page 142)

5-32 Chapter 5: Software support
Audio preferences
Click the icon to go to the Preferences page. This page allows you to
change various audio settings.
General options
Click the General tab to choose your playback and recording devices, enable/
disable the AudioESP™ feature, and enable/disable digital output.
Listening Environment options
Click the Listening Environment tab to set up your speaker, acoustic
environment, and enable/disable the Virtual Theater Surround function.