*********Installation notes************
Attention Please:
Before you install CMI9880 audio function driver, you need Microsoft High Definition Audio bus driver.

To knowing more information about Microsoft bus driver with universal audio architecture (UAA) High Definition Audio class driver, please reference website
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In Windows Vista, Windows Server 2003, Windows XP, and Windows 2000, the UAA class driver uses the DDI defined by the HDAUDIO_BUS_INTERFACE structure to manage UAA-compliant audio codecs. In addition, hardware vendors can choose to write custom device drivers that use one or both of these DDIs to manage their audio and modem codecs.

Hardware vendors should design their audio codecs to conform to the UAA hardware requirements document (to be published). In the absence of a custom audio driver from the vendor, users can rely on the system-supplied UAA class driver to manage their UAA-compliant audio codecs. However, an audio codec might contain proprietary features that are accessible only through the vendor's custom driver.