Asus P5B-Plus VISTA Edition - Manual (Page 145)

ASUS P5B-Plus Series 5-35
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.