IEI Integration NANO-9452 v4.02 - Manual (Page 165)

NANO-9452 EPIC Motherboard
Page 147
6.7.2 Southbridge Chipset Configuration
The Southbridge Chipset Configuration menu (BIOS Menu 22) the Southbridge chipset
to be configured.
BIOS Menu 22:Southbridge Chipset Configuration
 Audio Controller [AC`97 Audio]
The Audio Controller option allows selection of the audio controller to use.

Azalia D EFAULT The Intel® High Definition Audio controller is
enabled
 AC`97 Audio The on-board AC’97 controller is enabled
 All Disabled All audio controllers are disabled