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

[S C R. <rig...@gm...>]

On Sun, Jun 12, 2011 at 1:37 PM, Frank Kober <goe...@ya...> wrote:
> Hi Steve,
>
>
> Any attempts made to reduce your jitter? Do you have this with ALSA in general?
> Then a kernel with 1000Hz timer might arrange things. If the jitter happens with
> JACK MIDI Sync, maybe a reduced latency can improve the situation.
>
> How would you export the MIDI data? With a tool like QMidiArp, mainly done for
> live play/editing it would need an inbuilt recording tool. Is this what you have in mind?
> Otherwise, exporting the sequences and LFO data as MIDI files should not be a
> problem but you could do this with other tools as well.
> Have you tried recording QMidiArp's output into Qtractor for instance?
>
> Regards
> Frank
>

I've tried to reduce the jitter as much as I can.  I'm running 2.6.39
right and it was built doing "make oldconfig" against the config from
a Planet CCRMA RT kernel so it has a 1000HZ timer.

What I was hoping for was something where the sequences and LFO data
could be exported as midi files.

I've been experimenting a bit and it seems that this is mainly a
problem when the system is under load.  When I record QMidiArp into
Qtractor it lags a little bit, but not so much that quantizing doesn't
put things back into time.  However, when QTractor is also sequencing
an instance of Yoshimi things start to lag quite a bit more and get
inconsistent enough that quantizing will help, but it needs quite a
bit of manual cleanup afterward.  If QMidiArp is sequencing the
Yoshimi instance and simultaneously recording into Qtractor then it
gets so inconsistent that quantizing just makes things worse.  The
weird thing is once I play back the sequence from Qtractor and the
system is under load I don't hear any noticeable jitter.

But anyways, I think I have a workaround for now.

Thanks,
Steve