If there was anything in the PC Setup software to choose another audio source, I couldn't find it
but it's been a while since I was deep into this topic, or even tried it. Was it in Sound / Monitors & Sound control panel? I swear I didn't see another option there.
Do the Alchemy and Gazelle boards route audio through the GIMO? Sorry , haven't delved into the topic in some time.
I mean, even if they don't do audio, the GIMO is nice on the other equipped PCI Macs so you don't have to use that space-sucking y-cable.