[PD] MIDI latency problem

chi ball c_cb at hotmail.it
Thu Dec 3 17:45:59 CET 2009





	
	
	
	

Hi, I have a little *problem* with *MIDI latency* (linux Mandriva 2010.0):

- if I make a patch to
generate midi notes repeated, with a metro (for example [metro 200])
I listen the rithm irregular (instead in Windows -on the same pc- the
rithm is perfect..)

-if in the same patch I change [metro
200] in [metro 10] the midi notes output goes in crash, is'n possible
play midi notes speadily (instead in Windows -on the same pc- this is
possible).

-instead if I make an oscillator with a slide, the
pitch of sound change *perfectly in realtime*.

So the problem is
only of MIDI.
__________________________________
My settings:

-in
"/etc/security/limits.conf":
*              
-       rtprio          
0
*              
-       nice            
0
@audio - rtprio 89
@audio - memlock 288000#My RAM = 576MB
@audio - nice
-10

-in "/etc/modprobe.preload":
realtime mlock=1
gid=81#My user is in the "audio" group.
_______________________________
-in "qjackctl":

realtime: on
priority=89
frames/period=128
sample
rate=44100
periods/buffer=2
port maximum=256
timeout=200
output
latency=6
latency: 5.8msecmidi: seq
_________________________________________
in "puredata":
-I run pd with: pd -rt -jack -channels
2
-In "media" I set "jack" and "ALSA MIDI"._________________________________________
Any suggestion for this
problem?
Thanks,
c

P.S.: 

my o.s. is Mandriva 2010.0
Processor: Pentium III Coppermine
RAM: 576  MBSound Blaster Live! 5.1

:)
 		 	   		  
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