Re: [Rosegarden-user] Rosegarden, jack, latency.

[<det...@wp...>]

Hi.
I did as you said.
I unchecked Force 16bit in qjackctl - that was only checked option below 
Realtime option.
The Realtime option was checked already.
I changed timeout from 500msec which was earlier to 2000msec as you said.
But that changes didn't help - there are still tempo changes.
I tryed other synths than zynaddsubfx: qsynth and hydrogen.
I created very simple one short looped track for testing them.
And unfortunatelly in both there are tempo changes also.
But I've realised that this tempo changes aren't random.
They appears at the same moments in looped track - again and again.
Also I've realised something when I play midi records with General Midi 
through timidity and without running jack - it seems that there are no 
tempo changes and everything seems to be ok.
But when I run jack and try to play something with General Midi - there 
are no sound!
I can't play GM with jack runned.
Only if I run rosegarden without jack - then GM works fine.
If there are other solution for this?




>Hi.
>
>Have you tried any other sunth than zynaddsubfx? For example qsynth,
>do you still get the same results? I have had bad experience with 
zynaddsubfx
>with some instruments. I saw somewhere that it's not well optimized
>for realtime
>use.
>
>How do you start jackd? If you use qjackctl, have you checked the
>Realtime option,
>and unchecked the others below? You could play with the timeout option,
>for example set it to 2000 msec.
>
>Hope this helps.
>
>-Jani


> Thanks for reply Jani.
>
> But unfortunatelly I can't set up this problem as solved.
> Even if I use one zynaddsubfx program per track - there are still tempo
> changes.
> I just didn't listen it carefully.
> That can be hear especially if I set up jack with more frames.
> The tracks are played inequally.
> Also changing timing source from auto didn't solved this - I try all
> possible options (system timer, pcm playback, pcm capture)  - and none
> of them works better.
> But in lmms it seems that everything is ok - because even if I set
> frames=16384 in lmms, which gives me latency about 370ms - the tracks
> are played equally and there are no tempo changes in lmms.
> So if all tracks and instrument have equal latency at the end you hear
> that record is played correctly only little later than source notes.
> And that is ok when you don't need to record vocals or real time playing.
> But unfortunatelly in rosegarden the tracks are not played equally and
> have tempo changes on each track.
> If there are other solution for this?
>
> Thanks in advance.
>







> Hi Michael,
> 
> I feel sorry you haven't got any replies to your posts.
> 
> If you experience unexpected playback tempo changes, you could try to
> change midi sequencer timing source from (auto) to something else.
> At least it helped me. Can't help you with the other issues though.
> 
> - Jani
> 
> 2010/8/21  <det...@wp...>:
> > Hi.
> >
> > It's me again.
> >
> > I wrote mail few days ago about resegarden+zynaddsubfx, latency, delays
> and
> > tempo changes.
> >
> > I think that I found something that can help somebody with that kind of
> > problem.
> >
> > It seems that the delays and tempo changes was happened because of to weak
> > serial communication from rosegarden to zynaddsubfx through jack.
> >
> > I had connected only one zynaddsubfx and used it in all tracks.
> >
> > Only zynaddsubfx channels was different on each track.
> >
> > So next I runned and connected as many zynaddsubfx programms as I had
> > tracks.
> >
> > Every track had connected one unique zynaddsubfx programm.
> >
> > And it seems that this configuration works better.
> >
> > I don't know why - but it works, there are no tempo changes for now.
> >
> > So if anybody knows why this happen he can comment this post.
> >
> > If this post was usefull for anybody - great.
> >
> > Thanks for help.
> >
> > Michael.
> >
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