Asus M2N-SLI - Manual (Page 140)

-2 Chapter : 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.
Microphone options
Click the Listening Environment tab allows you to optimize your microphone input
settings.