I'd love to work on this, but am still unsure where to begin. I need some sort of sound driver (preferably the VMware one!) that will work with ReactOS, with which I can test.
I have almost working sound support with 3rd party drivers. Most of the changes are already commited to CVS except the biggest one and that is improved DMA support (16-bit, auto initialization, ..., fixes). In my local tree the sound sort of works, but there are still some problems with DMA mapping that I need to resolve before commiting the stuff. Currently it sounds like crackle combined with the correct sound changing in regular intervals.
That is excellent news! :)
Shame I couldn't really do more than I did :(