[mythtv-users] Sound card problem

[Rod Smith]

On Friday 09 February 2007 03:52, Bob Sully wrote:
> Hi all -
>
> I'm having a problem with my Audigy 2 ZS sound card...
...
> While watching analog/S-video channels in live TV, I get a repeating audio
> echo.

I tore my hair out for two days over that problem! I finally fixed it and 
added notes about it to the wiki:

http://www.mythtv.org/wiki/index.php/Troubleshooting:Sound

> There is a control in alsamixer called "PCM Capture" which I found out
> apparently is causing this loop.

For me, the channel was called "duplicate front," not "PCM capture." The 
symptom sounds identical, though, so it's probably just a naming difference 
between our drivers.

> However, I can't find a way to shut it 
> off.  Kmix doesn't give me any input controls (apparently a
> commonly-reported bug) and, while I can see it in alsamixer, I can't shut
> it off.  I can run it down to zero, but as soon as I start live TV, it
> goes back up to 96...echo-echo-echo.

Try muting it in alsamixer by typing "M" when you've highlighted the channel. 
If that doesn't work, I'm not sure what to suggest, unless maybe you can find 
another channel called "duplicate front," in which case I'd say to try it.

If you find a solution that deviates from mine, I recommend you edit my wiki 
entry on this problem.

-- 
Rod Smith
http://www.rodsbooks.com