I have an aha-2940au adapter, however, its bios would not load. Sata was enabled onboard (jumper SATA_EN1). Sata's bios was loaded instead of aha-2940's. After WinXP install, no soundcards were found, just the nForce audio codec interface. So I disabled SATA (jumper SATA_EN1). Aha2940au and sound device were found and respective drivers loaded.
HOWEVER, the default device for sound playing (reproduction) was set as Modem #0, instead of "nvidia nForce audio". That was a leftover of the initial installation, when SATA was enabled and WinXP couldn't find the sound device.
Very simple. I confess I was scared.
Thank you very much for your time!!!