[LAU] jack and the merging of soundcards

[Paul Davis]

On Thu, Nov 20, 2014 at 3:56 PM, Ede Wolf <listac at nebelschwaden.de> wrote:

> I may perspectively run into a shortage of audio inputs and stumbled
> across a blog, that reads like it is possbile to "merge" two soundcards
> into one virtual, that eventually looks as a single one to alsa. However,
> that blog does not mention jack.
>
> Also, in an stone old ardour thread Paul Davis suggests to a similar
> problem: ", then you simply get 2 digifaces", but again, this may have been
> before the rise of jack.
>
>
> And now I am wondering wether this is a possible or even reliable way to
> trick jack into being able to to finally handle more than one soundcard, if
> presented by alsa as being a single one.
>

this is a function of the ALSA driver for a given device, plus the
capabilities of the device itself. We still don't know for sure whether
ALSA can get all the cards started reliabily in < 1sample, but it seems as
if it should.

a more device independent way of doing this, but one that implies sample
rate conversion going on, is to use zita-a2j to allow JACK to use more than
one device. With current JACK1, this is even builtin to JACK itself and can
be done from the command line.
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