[LAU] Jack vs. Alsa, PianoTeq demo: Alsa wins!

Paul Davis paul at linuxaudiosystems.com
Sun Jun 12 20:21:34 UTC 2011


On Sun, Jun 12, 2011 at 12:45 PM, Aaron Krister Johnson
<aaron at akjmusic.com> wrote:
> Hi, I realized that this would be pertinent info this morning, thanks for
> reminding me...
> I'm on Arch Linux, and I used both kernels 2.6.33-rt and the standard
> 2.6.32-LTS (long-term support) with the same results....
> It's Jack 0.118.0-2 and also 0.120.2-1 that were problematic for me. They
> also caused weird behavior with fluidsynth-1.1.3--with my M-Audio KeyRig 49
> USB keyboard, there were HUGE (.5 seconds!!!) midi delays.
> I installed jack2-svn today and the fluidsynth issue is now gone. And,
> although the PianoTeq xruns are much better, they are still slightly more
> apparent than with Alsa alone.
>
> I don't know what happened, but, being pragmatic, one has to just find
> versions that work....yikes!

as i was hinting, its not just about versions, but also settings. you
don't know what settings Pianoteq is using when it interfaces with
ALSA directly. you do know what settings JACK is using ...


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