[PD] MIDI In-to-Out Latency

[Pagano, Patrick]

it's probably midiyoke which has notoriously had issues with Vista and now i assume 7
try midi maple


________________________________________
From: pd-list-bounces at iem.at [pd-list-bounces at iem.at] On Behalf Of Pedro Lopes [pedro.lopes at ist.utl.pt]
Sent: Saturday, June 05, 2010 10:06 PM
To: Jim Aikin
Cc: pd-list at iem.at
Subject: Re: [PD] MIDI In-to-Out Latency

Its possible to track when the message is generated, the issue is with cubase not being an open system is not possible (in my mind) to check its arrival with precision.

>I haven't tried it yet, but it's irrelevant to me. I don't want to play a simple sine wave. I'll try it just >because I'm curious, but even if it's perfect, that won't help me.
It can give you some hint/clue about the problem.

>This may be a Windows 7 64-bit problem. Or it could be because I'm using Pd Extended. Or it could >be something else.
That's exactly why I suggested to test the simple patch above, if it is any of those issues you suspect, it should come up just when using pd and midi.

On Sun, Jun 6, 2010 at 12:59 AM, Jim Aikin <midiguru23 at sbcglobal.net<mailto:midiguru23 at sbcglobal.net>> wrote:

Just to see if I got that right, the rip is:

keyboard ->  YOKE in ->  YOKE OUT ->  PD IN ->  PD OUT  ->  YOKE IN ->  YOKE OUT
->  CUBASE IN


No. The pathway is: keyboard ->M-Audio Firewire 410 MIDI in (via the FW 410's driver) -> PD in -> Pd out -> Yoke in -> Yoke out -> Cubase in. The Yoke is only in the path once.

The sluggish response is clearly due to Pd. Also, it's consistent whether

Pd's patch window is in or>out of edit mode.
How can you be sure? You are making two trips using that patching software
(I confess I had no clue what MIDI-OX was previous to your thread), there's
latency in all of the above hops (MIDI message passing through softwares) .


I'm sure because when I use the identical pathway but substitute MIDI-Ox for Pd, the latency goes away.
Do you tried to see how is Pd's latency in a "simple play sine wave with
MIDI note" patch? that will give you the response time of keyboard ->  PD.


I haven't tried it yet, but it's irrelevant to me. I don't want to play a simple sine wave. I'll try it just because I'm curious, but even if it's perfect, that won't help me.

Then test the oposite, sending PD to your soundcard MIDI and playing some
device or other solution, allowing you to test the output (by generating a
MIDI message within PD and route it out od PD).


Generating a MIDI message within Pd would tell me nothing, because I would have no way of knowing exactly when it was being generated.

p.s. just for comparison I use MIDI in PD in WinXP without any noticeable
latency, although only in Linux I do fancy patching in-out and have no
noticeable latency (using everything in realtime).


This may be a Windows 7 64-bit problem. Or it could be because I'm using Pd Extended. Or it could be something else.

--JA


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--
Pedro Lopes
contacto: jazz at radiozero.pt<mailto:jazz at radiozero.pt>
website: http://web.ist.utl.pt/Pedro.Lopes