[LAU] midi backend not working in qjackctl?

Ralf Mardorf ralf.mardorf at alice-dsl.net
Wed Mar 14 16:32:06 UTC 2012


On Wed, 2012-03-14 at 12:04 -0400, Paul Davis wrote:
> On Wed, Mar 14, 2012 at 11:52 AM, Ralf Mardorf
> <ralf.mardorf at alice-dsl.net> wrote:
> 
> > Especially in combination with Jack2's -Xalsarawmidi you'll get zero hw
> > MIDI jitter, aka hard real-time.
> 
> I don't know if this is the new code that was added recently.
> 
> If its the old stuff then it absolutely is not zero jitter. You're
> confused about the difference between "real time", "low latency" and
> "jitter". The whole problem of the old code is that was absolutely
> "deliver it as fast as possible" and that is precisely is what causes
> jitter.
> 
> --p

IIRC it was in April 2011 Jack2 1.9.8 from svn. Here hw jitter is close
to zero.

- Ralf



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