That was it:

[ adamk@sorrow - ~ ]: ls -l /dev/mixer*
lrwx------  1 root  wheel       6 Jun 11 02:20 /dev/mixer -> mixer0
crw-r--r--  1 root  wheel  30,  0 Jun 11 13:30 /dev/mixer0
crw-rw-rw-  1 root  wheel  42, 17 Jun 11 02:20 /dev/mixer1
crw-rw-rw-  1 root  wheel  42, 18 Jun 11 02:20 /dev/mixer2
crw-rw-rw-  1 root  wheel  42, 19 Jun 11 02:20 /dev/mixer3

Not quite sure what was up with /dev/mixer0 and those strange major and
minor numbers, but once I fixed it, aumix started working.

Thanks :-)

Adam

On Wed, 11 Jun 2003, Quentin Garnier wrote:

> Date: Wed, 11 Jun 2003 22:17:02 +0200
> From: Quentin Garnier <netbsd-current-users@quatriemek.com>
> To: Adam K Kirchhoff <adamk@voicenet.com>
> Cc: current-users@netbsd.org
> Subject: Re: mixer problems...
>
> Le Wed, 11 Jun 2003 14:57:30 -0400 (EDT)
> Adam K Kirchhoff a ecrit :
> >
> > I have a machine at home running NetBSD -current (1.6T).  I've used it
> > with both my Yamaha-754 sound card and SB Live!  In both cases, the card
> > is detected and the driver loads.  Audio works fine (mpg321 & esd are
> > all I've tested so far).  However, aumix and mixerctl both complain that
> > /dev/mixer0 is not configured.
> >
> > I've checked in the -current archives but haven't come across anything
> > helpful.  Am I doing something wrong?  Is this a bug with the audio
> > driver?  Or the audio subsystem?
>
> Mmm, I'd say /dev/mixer0 doesn't have the correct major and minor numbers.
>
> It should be 42, 16.
>
> --
> Quentin Garnier - cube@cubidou.net
> "Feels like I'm fiddling while Rome is burning down.
> Should I lay my fiddle down and take a rifle from the ground ?"
> Leigh Nash/Sixpence None The Richer, Paralyzed, Divine Discontents, 2002.
>