[LAU] How to make Jack remember soundcards, not alsa-slots

[torbenh]

On Tue, Dec 14, 2010 at 11:55:03AM -0500, Joe Hartley wrote:
> On Tue, 14 Dec 2010 17:44:36 +0100
> ailo <ailo.at at gmail.com> wrote:
> > I'm looking on how to sync the two cards, delta-1010 and delta-66. 
> > AFAIK, no matter the method, it seems one must sync them using spdif 
> > (don't think this is needed on Windows, but perhaps that has to do with 
> > proprietary drivers?).
> 
> If you want to use these two cards together, then syncing with SPDIF is 
> pretty much required.  The alsa_in/out programs add latency, and as the 
> website said, you should not record using those programs.

alsa_in/out programs can yield lower latency than jackd itself.
and i doubt, that anyone can hear the artifacts.

the website is for the version that came with jack 0.116.x
but the new algorithm is a lot better.

> 
> I can guarantee that you'd need to sync them with SPDIF under Windows as
> well as Linux, or you'll get clock drift between the cards.

alsa_out tools are build to compensate the clock drift.

> 
> > There is this method:
> > http://www.jrigg.co.uk/linuxaudio/ice1712multi.html
> > 
> > If someone has some experience in using multiple cards, I won't mind a 
> > pointer or two.
> 
> I've put up how I got it to work here: http://delta.brainiac.com/deltasync.html
> I run 2 Delta 1010s synced up and it works well for me.
> 
> -- 
> ======================================================================
>        Joe Hartley - UNIX/network Consultant - jh at brainiac.com
>  Without deviation from the norm, "progress" is not possible. - FZappa
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-- 
torben Hohn