[PD] Limit bandwith for MIDI output / precise metro

[Jean-Marie Adrien]

thanks, clear indeed !
JM

Le 27 nov. 2012 à 10:36, IOhannes m zmoelnig a écrit :

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> On 2012-11-26 23:29, Cyrille Henry wrote:
>> 
>> 
>> Le 26/11/2012 22:38, Jean-Marie Adrien a écrit :
>>> Thanks Miller !
>>>> -nosound -udiobuf 5 -slepgrain 1
>>> Definitely academic  :)
>>> 
>>> But I run intense audio on this PD instance, together with midi 
>>> driving lights in real time. here are the flags  :
>>> 
>>> -rt  -noadc -midioutdev 1,2 -audiooutdev 2 -outchannels 8
>>> 
>>> phasor~ would not do it ?
>> phasor~ will do provide a better clock than a metro since pd
>> internal time is "perfect". your problem come from jitter between
>> "pd time" and "real world time".
> 
> just to clarify:
> both [phasor~] and [metro] live in an ideal world with perfect timing.
> unfortunately this ideal world is not "real" (compared to your wall
> clock) and has a slight jitter.
> the jitter of [phasor~] is cleared by sending samples in a buffered
> way to your soundcard.
> with MIDI, Pd doesn't do any buffering and no synchronisation to some
> external clock is done, so messages appear in bursts which you notice
> as a inaccurate timing.
> but the problem is really not Pd's internal timing (which is "ideal")
> but the communication to the outside world.
> 
> so to answer that specific question: [phasor~] will help you, but only
> if you are able to use the signal that comes out of your soundcard,
> which is synced to the wall clock, in order to trigger (or do whatever
> you want to do).
> if you only want to use audio-objects as an internal clock source,
> then you will gain exactly nothing (but lose a lot, since you
> complicate things which you normally get for free).
> 
> 
>>> maybe simply change MIDI interface to without-driver model.
>> yes, that sound like a good solution.
> 
> well yes, if your midi driver is broken (that's how i interpret a
> "weird stacking process"), you should probably replace that.
> 
> fgmadr
> IOhannes
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