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Date: Tue, 21 Mar 2006 16:36:57 +0100
From: Niklas Sorensson <nik@cs.chalmers.se>
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Cc: freebsd-multimedia@FreeBSD.org
Subject: Re: Poor sound quality with snd_via8233
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>> apa# /usr/sbin/mixer
>> Mixer vol      is currently set to 100:100
>> Mixer pcm      is currently set to 100:100
>> Mixer line     is currently set to 100:100
>> Mixer mic      is currently set to 100:100
>> Mixer cd       is currently set to 100:100
>> Mixer rec      is currently set to 100:100
>> Mixer igain    is currently set to 100:100
>> Mixer ogain    is currently set to  10:10
>> Mixer line1    is currently set to  75:75
>> Mixer phin     is currently set to   0:0
>> Mixer phout    is currently set to   0:0
>> Recording source: mic
>>
> Reduce those "100" to "85", or less. You're overdriving it too much,
> hence, the constant distortion. If you have amplified speaker, use the
> volume knob there.

Duh, that was simple enough! It seems that pcm was mostly responsible for the 
overdrive. Thanks!

> Report (and partially from my experiences) indicate that using
> SCHED_ULE can give better audio/multimedia performance. Perhaps you
> want to give it a try.

It works satisfactory now, but I'll give it try anyway.

/Niklas