[LAU] help with guitarix settings - jack issue

[Arnold Krille]

On Sunday 27 March 2011 15:21:42 Peder Hedlund 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 :) .

Jacks uses one system-sample-clock. And all sound-devices then have to use 
that as well. Doesn't matter whether one device is only playback or only 
recording. All hardware-sample-clocks have to be synchronized unless you want 
to use alsa_in (or alsa_out) and have automatic resampling inserted into the 
chain. And if you want good quality, you don't want resampling. At least you 
don't want it added automatically without control...

Have fun,

Arnold
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