Hi Snipersnest
I realise that this post is quite old and you have probley solved this by now but this might be usefull for someone else running in to the same situation.
I had the same problem when i set up ubuntu on my Asus A8N-SLI so i had to set up a dmix plugin for ALSA and now it works fine i used this
guide but there are a lot around just try googleing dmix plugin