KMix and KEnvy24

[Valentin Rusu]

On Sun, 2009-01-04 at 17:02 +0100, Christian Esken wrote:
> Am Mittwoch, 31. Dezember 2008 schrieb Valentin Rusu:
> > 
> > On Tue, 2008-12-30 at 00:34 +0100, Christian Esken wrote:
> > > Am Freitag, 26. Dezember 2008 schrieb Valentin Rusu:
> > This chip have a special way to handle stereo streams and to route
> > signals from inputs to the outputs. It contains a digital mixer, but one
> > can route an input signal directly to an output, bypassing the mixer. 
> > [...]
> > Confusing, isn't it ?
> 
> Not really. These route controls sound like to be similar to those found in other cards (Audigy, afaik).
> I have not yet bothered with this interface. Probably I would, but couldn't find any routing API in http://www.alsa-project.org/alsa-doc/alsa-lib/group___simple_mixer.html .

Well, Audigy is simpler, as it doesn't (as I know) send left signal to
both left and right outputs. In ICE1712 chips, output signal
contribution for an input follow these formulas :

outL = Volume1L * inL + Volume1R * inR;
inR = Volume2L * inL + Volume2R * inR;

There are 4 (four) independent volume sliders for a single stereo
input ! In normal situations (eg stereo cards) Volume1R and Volume2L are
always equal to 0. Otherwise, the stereo image of input signal is
altered. 

I attach here a screen capture of envy24control which shows how sliders
should be configured to correctly retain stereo image of an input
signal. Please note that PCM L/R notation is replaced by "PCM Out 1" and
"PCM Out 2".

Cheers,
Valentin

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