Re: Jack vs. Alsa, PianoTeq demo: Alsa wins!

[Aaron Krister Johnson <aaron@xxxxxxxxxxxx>]

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 JackÂ0.118.0-2 and alsoÂ0.120.2-1 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!

AKJ

On Sun, Jun 12, 2011 at 4:36 AM, rosea.grammostola <rosea.grammostola@xxxxxxxxx> wrote:

Which Jack version? Which kernel? Which OS?
Using Pianoteq myself, runs like a charm, with JACK, but it asks for pretty some CPU...
\r

Â

On 06/12/2011 09:40 AM, Aaron Krister Johnson wrote:

Hi all--

I'm wondering if anyone else has experienced this:

I'm considering purchasing PianoTeq, but I wanted to try the demo. It
seems to work better with just the alsa driver than it does with jack, a
reversal of the usual situation.

I tested this several times by playing fast glissandi on the default
piano preset. Each time, my little EEE-PC netbook under jack choked with
xruns and a brief silence while PianoTeq 'reset' itself, but Alsa alone
chugged away with no xruns unless there was an extreme amount of load....

I'm wondering if anyone can comment on this. It seems odd, especially
since the jack developers claim jack adds no latency by itself to the
picture in any situation---so, do we have a situation where the code is
better written for the alsa driver than for jackd? It seems we do, in
this case....

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--
Aaron Krister Johnson
http://www.akjmusic.com
http://www.untwelve.org

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