Q about alsamixer:CD

[Paulo Cavalcanti]

On Tue, Jul 28, 2009 at 2:21 PM, Mikkel L. Ellertson <
mikkel at infinity-ltd.com> wrote:

> Mike Wright wrote:
> > Hi all,
> >
> > I too have been struggling with sound but am making some progress.  One
> > question that remains after years of fedora:
> >
> >   In the alsamixer applet one of the available input controls available
> > under preferences is CD.
> >
> > My CD has *always* been controlled by the PCM input control.  I've
> > connected the separate cable from the drive to the motherboard with no
> > effect.  (It seems that the audio cable is useless, too?)
> >
> > So here's the 50cent question.  Just what does the CD input control?
> >
> > Inquiring minds want to know ;/
> >
> It controls the input labeled on CD on the sound card. This will
> only produce output if you have the analog audio cable between the
> CD-ROM drive and the sound card. The reason you use the PCM input to
> control the CD volume is because the player is getting the data from
> the drive over the (S)IDE interface, and feeding the digital data to
> the PCM input of the sound card.
>

If I remember well, grip is one application that gets the sound via
the anlog cable.



-- 
Paulo Roma Cavalcanti
LCG - UFRJ
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