Problem with audio apps and mixer

[Paul B. Mahol]

On 7/3/09, Alexander Best <alexbestms at math.uni-muenster.de> wrote:
> hi there,
>
> i've never had a problem to adjust the volume with audio apps like mplayer
> or
> mpd. recently however i'm experiencing this strange behaviour. the app's
> volume doesn't match the volume that `mixer` reports. here's an example:

CURRENT have VPC.
You can completly disable such feature with this sysctl:
hint.pcm.X.vpc (default=undefined, enabled)
            0=disable, 1=enable
            Notes: The only place to enable/disable vpc.
                   Enabling/Disabling requires driver reload.

here is explanation with more details:
http://people.freebsd.org/~ariff/SOUND_4.TXT.html

-- 
Paul