[Qmidiarp-user] Re : Re : Re : Feature Request: Export Functionality

[Frank K. <goe...@ya...>]

> Yes, this is 0.4.1 with the patch applied.  Originally I had Qtractor
> using set to "default" for the queue timer, but I've since it 
> changed
> it to "System Timer (1000HZ)"...probably the same thing.
> 
> I uploaded a couple of examples to my dropbox.  They are all using
> Qtractor as the transport master and at 115BPM recorded into MixBus
> with Hydrogen doing a click:
>

Thanks Steve, 
the examples clearly show the problem, however more questions before digging into what this could be (I clearly don't reproduce it here on an old 2.6.33 rt kernel):
1) Does the jitter appear as well when not using jack transport sync? No proof needed if your impression is so.
2) What is your JACK latency ?
3) Do you use a CPU frequency governor like ondemand that might vary CPU frequency during play?

Reasons for my questions are, I'd like to know whether qmidiarp just poorly syncs due to some reason or whether the ALSA timer for some reason is unstable

Thanks in advance
Frank