gumstix says bang womp womp womp!
I have sound coming out of my little linux box through the audiostix. sweeeet.
How to do it:
Recompile buildroot to include aumix and bplay
modprobe snd-pxa2xx-ac97, snd-pcm-oss, and snd-mixer-oss
set bolume to (say) 60% with aumix -v 60
then bplay a wav file with bplay /path/to/wav
wow. This is awesome!
Now... to compile an audio language... like (say) supercollider, pd, or chuck. :)