Re: [LAU] Output to 2 sound cards simultaneously

First, let me say I am mostly ignorant here but I still may be able to help.

What do you want to play to the two cards? The same stereo stream? Two
different stereo streams? 4 mono tracks of a single multi track recording?

I see that in the thread, someone mentioned not being able to keep the cards
in sync. I have seen that problem mentioned before but also that if your
cards do word clock that this can be overcome iirc.

I also see that someone mentioned jack and you seem to have always had trouble
with it. Jack has alwasy been my friend. If I can find some time today ot
tonight, I will try and run a jack test with two sound cards for you. One
internal on my laptop and one usb.

If you want to try the jack route, I would be happy to help out some. Try and
catch me as zloc or zotz in #rivendell on irc.freenode.net ...

all the best,

drew

On Thursday 27 September 2007 10:37 pm, Mark Constable wrote:
> I've read this a couple of times over the years but it still
> does not make much sense (to me)...
>
> http://alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html
>
> As a baseline, say I started with this, where could I go
> from here to get an app (ie; Amarok) to play back out two
> soundcards at once ?
>
> # cat .asoundrc
> pcm.NVidia { type hw; card NVidia; }
> ctl.NVidia { type hw; card NVidia; }
>
> pcm.USX2Y { type hw; card USX2Y; }
> ctl.USX2Y { type hw; card USX2Y; }
>
> pcm.shared {
> type dshare
> ipc_key 321456 # any unique value
> ipc_key_add_uid true
> slave NVidia
> slave USX2Y
> bindings {
> 0 0
> 1 1
> }
> }
>
> --markc
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user@email-addr-hidden
> http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
>
> !DSPAM:46fc690f310671410093335!
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@email-addr-hidden
http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-user
Received on Fri Sep 28 16:15:06 2007