It would be nice to do plan 9 audio if only to show people how it can be done. Anyone who deals with audio on linux knows how not to do it; but it's probably very hard to get it right. I know I could do no better.
It would be nice, I think, to do it out of the kernel ... still better to do it in a way that makes it easy to adopt new audio formats without having to rip out the guts each time and start over -- which seems to be the linux problem. The ideas here certainly sound like potentially good ones. ron