Re: C-Media PCI CMI8738-MC6 - CD volume/mute does not work

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On Mon, 06 Nov 2006 15:20:01 -0500
Jonathan Addleman <jonathan.addleman@xxxxxxxxxxxxxx> wrote:

> alf wrote:
> > Hi,
> > 
> > I am a new member of this group and need some help.
> > 
> > When I listen to the CD, I am able to adjust only by Master Volume. CD 
> > Volume and the CD mute check does not work.
> > 
> > I used Madriva 2006 and 2007 which uses alas 1.09b and 1.12 respectively.
> > 
> > 
> > I have rather older hardware - this is AMD XP 1700+ with Soyo Dragon + 
> > motherboard with on board CMI8738-MC6.
> > 
> > Evrything else works fine, modules looks loded fine.
> > 
> > Any insight what is wrong? How can I debug the problem.
> > 
> > Thx in advance ...
> 
> 
> It's probably just that the motherboard has a few different inputs, and
> whichever one the cdrom is plugged into isn't labelled 'cdrom' in the
> mixer. Are there other mixer elements that could be controlling the
> cdrom instead? Line in, phone, aux, etc...?
> 
> 

In more detail, the CD input is typically an analog input, so if your
CD drive's analog output is not connected to your sound card's CD analog
input, you won't be able to listen to CDs using analog route and to
control the volume.

And it is good in a sense - the master volume deals with PCM (digital)
signal, so you do not have cheap CD ROM DAC and most likely cheap
sound card ADC in the way of your signal.

That is, from the point of view of sound quality it is best to have
as little analog to digital and digital to analog conversions on the
way as possible.

--Sergei.

-- 
Visit my http://appsfromscratch.berlios.de/ open source project.

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