I spent the time this evening downloading the Microsoft C/C++ toolkit and the SDK. I have only built emu for linux and plan9 so far. So it's time to start building an XP version. I also expect to be modifying the audio driver to add some more advanced features, such as 8 channels.
While waiting for the downloads I found this site about audio networking interesting. A DTMF decoder would be a nice lab to do some night.
I tried compiling the inferno distribution for XP. I'm missing LIB.exe. I used link /lib instead. Got most of it compiled, including emu.