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Re: Playing Audio CDs



On Sun, 6 Jun 2004 16:28:00 +0300
David Baron <d_baron@012.net.il> wrote:
>
> Play with no problem at all, once one finds the correct directory (they
> are not "mounted" like other file-systems media.
> 
> However, the control on XMMS (volume, equalizer, etc.) have not effect
> on the volume or sound. Audio files played off disks work normally.

Right.  That's normal; it's because of the way soundcards are constructed.

1.  The volume setting on XMMS is not a "master volume" control.  It
allows you to directly adjust what's listed in alsamixer as "PCM".  It
adjusts the volume associated with PCM audio data that's coming to
the soundcard's codec from the audio controller (and, before that,
the PCI bus).

2.  Your CD player is connected to your soundcard by a direct cable.
The PCM audio data coming from the CD player does not come to the
codec from the datapath taken by other sound data, and consequently
is not affected by the "PCM" volume setting.  "Master" is a little
further downstream, and thus can affect both.  This is the way
soundcards are designed.

3.  So does that mean there's no way to adjust the volume of CD
audio independently of the master volume?  Not necessarily; on most
soundcards, there's a "CD" volume control that fills the same role
as the "PCM" volume control, but only applies to data from the CD
player.  It can be found using alsamixer.  However, there's no way
(that I know of) to get xmms to assign its volume control to an
adjustment of "CD" rather than "PCM".

-c

-- 
Chris Metzler			cmetzler@speakeasy.snip-me.net
		(remove "snip-me." to email)

"As a child I understood how to give; I have forgotten this grace since I
have become civilized." - Chief Luther Standing Bear

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