I haven't got sound running yet.
Don't forget that when all else fails, USB Audio always works.
All you need is a dongle ($5-10) and the drivers (if not already installed, you can find Lars Erdmann's drivers on recent AOS ISOs at 'x:\CID\SERVER\ARCAPKG\USBAUD2.WPI').
FWIW... in a quest for a bit of modernity, I use a USB-Audio-to-Bluetooth dongle ($15-20) paired to my portable BT speaker. I also use 'ASwitch' (in your Desktop MM folder) to automatically switch from the built-in audio to USB Audio when I plug in the dongle. .