[LAU] help with guitarix settings - jack issue

[Dominic Sacré]

On Sun, Mar 27, 2011 at 3:21 PM, Peder Hedlund <peder at musikhuset.org> wrote:
> Quoting Dominic Sacré <dominic.sacre at gmx.de>:
>
>> More importantly, you can only use two sound cards with JACK at the
>> same time if their sample clocks are synchronized.
>
> Are you sure this applies to using different cards for recording and
> playback?
> I assumed it mostly mattered when trying to record from multiple cards (not
> that I have ever tried any of the scenarios :) .

Same thing... All JACK does is basically move audio samples between
sound cards and applications. What that means is that every device
involved must produce/consume samples at the same rate.
The only way to overcome this is resampling, but for good reasons JACK
won't do that unless you ask for it (by using alsa_in or alsa_out).


Dominic