You can use 'alsamixer' in the console, and press 'M' to unmute boxes. Uses 
up/down cursor keys to adjust volume accordingly.

On Tuesday 18 February 2003 5:05 pm, Frank Barknecht wrote:
> Hallo,
>
> I have a Edirol UA-20 USB audio device. I currently (have to) use
> alsa-rc6, configured according to:
>
> http://www.alsa-project.org/alsa-doc/doc-php/template.php3?
> company=Edirol&card=UA-20&chip=&module=usb-audio
>
> /proc/asound/cards shows it, I can play with alsaplayer and such, but
> I cannot hear anything!!
>
> I mean, *I* can hear very well, of course, but there's nothing coming
> out of my speakers.
>
> According to alsa-project.org, I should procede like that:
>
> "Now adjust your soundcards volume levels. All mixer channels are
> muted by default. You must use a native mixer program to unmute
> appropriate channels,for example alsamixer from the alsa-utils
> package. Note that some usb-audio devices do not have internal mixer
> controls."
>
> The UA-20 seems to fall into the latter case: "amixer scontrols" shows
> nothing, alsamixer won't start.
>
> Does anyone have an idea, how I could unmute this box?
>
> Thank you very much.



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