On Wed, 12 Dec 2007, Jan Kryl wrote:

> The biggest pain is to figer out meaning of control knobs in mixerctl
> (the specification of your particular azalia chip will help you). Once
> you know this, it should be quite easy to send the sound signal to the
> right output jack and control its volume.

I opened a PR for this last week:

http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=37478

I have noticed several questions about azalia audio on various NetBSD 
lists. And I had may own problems with it too.

  Jeremy C. Reed