[linux-audio-user] How can i set this up?

[Mark Williams (MWP)]

Thanks for all the help guys.

Im still trying to work out how JACK works... the end-user docs for its
operation are almost non-existant. All i seem to find are devel docs and simple
FAQ's like those on the JACK website.

I dont have X installed, so all these nice X windows JACK utils are useless to
me. And no... im not going to install X either.

If im going to use JACK to tie all this together, my first problem is getting it
working with a multichannel ALSA device.

The output card is a Envy24HT... i have asound.conf setup for a PCM per stereo
output (evny_1, envy_2, etc).

How do i tie these channels together to make a single 10 channel device that
JACK can then output to?

Ive tried using "type multi" for a PCM device in asound, but i cannot get it to
work.... even this doesnt work:

pcm.multi
{
	type multi;
	slaves.a.pcm "envy_1";
	slaves.a.channels 2;
	bindings.0.slave a;
	bindings.0.channel 0;
	bindings.1.slave a;
	bindings.1.channel 1;
}

where "envy_1" looks like:

pcm.envy_1
{
        type plug
        slave.pcm {
                type hw
                card 1
                device 0
                subdevice 0
        }
}

aplay to "envy_1" works fine.
aplay to "multi" says its working, but gives no sound output.

Ill leave it there....
Ill mention the second problem, when this is worked out.

Thanks again everyone.

> Hi,
> Zitat von Arnold Krille <arnold at arnoldarts.de>:
> 
> > On Tuesday 16 March 2004 12:01, Mark Williams (MWP) wrote:
> > > Because as stated in the Brutefir docs, you must have the same number of
> > > JACK inputs & outputs otherwise an error is produced.
> >
> > Just try to use jackd in Playback-only mode and you will see that this is
> > wrong. I have a soundcard here where I have a stereo-in and a 6-channel out
> > and jackd works well with this...
> 
> I suppose, Mark is talking about BruteFIR here. It might well be, that Brutefir
> does not allow to specify different BruteFIR playback and capture channel
> counts. I never used BruteFIR, but it's the same with Pd, which does not
> allow this. (It does allow capture- or playback-only.)
> 
> All this does not affect Jack itself, of course.