[Openvortex-dev] Re: Volume per voices [Feature Request]

[Raymond]

Takashi Iwai wrote:
> At Mon, 01 Aug 2005 00:37:26 +0800,
> Raymond wrote:
>
> > Jaroslav Kysela wrote:
> >
> > > On Thu, 28 Jul 2005, Raymond wrote:
> > >
> > >
> > >
> > > > In theory, and sound cards with hardware mixing can support this kind of
> > > > volume control.
> > >
> > > Nope. Please, define the controls at the driver initialization phase and 
> > > make them inactive when the stream is not open. See emu10k1 or trident 
> > > driver for hints. You must also map the voice volume with substream 
> > > number.
> >
> > Beside volume control, Is it feasible to bind other controls (e.g.
> > Interaural Time Difference, Interaural Level Difference and SAMPLE RATE 
> > CONVERTOR - Doppler Effect ) to the substream ?
>
>
> I think yes.  Whatever directly bound to a PCM substream should be
> handled as IFACE_PCM with a certain subdevice number.

It's OK for au88x0 to use a sample rate different from that of PCM 
stream play the PCM stream to produce a different pitch.

Does the alsa-lib really allow using a kcontrol to change the sample 
rate while playing the PCM to produce the Doppler Effect ?