Unfortunately I've been very preoccupied with other projects and while this one has been on the back burner for a while I really haven't had a chance to get to it. The good news is though that in some research for a completely unrelated project I stumbled across some interesting information relating to the tablets and their audio subsystem. Two important points to note: First, from the documentation I've seen, apparently the tablets run ESD to handle all the audio routing on the device; that would explain why even if your USB audio device is recognized, it's not actually used for audio out. The good news here though is that theoretically you should be able to tell ESD to output to the USB device instead of the native DSP... I don't know much about ESD but it shouldn't be that hard to figure out. I also noticed that ALSA seems to have some extra maemo support in the latest versions, so that may come in handy as well. Anyways, I'll try to get to it again shortly...

-Rob