Re: [Jack-Devel] OS X jack midi message issues between jack and core midi

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DateSun, 15 Jul 2012 13:12:39 -0400
From Paul Davis <[hidden] at linuxaudiosystems dot com>
ToIain Duncan <[hidden] at gmail dot com>
Cc[hidden] at lists dot jackaudio dot org, [hidden] at yahoogroups dot com
In-Reply-ToIain Duncan [Jack-Devel] OS X jack midi message issues between jack and core midi
Follow-UpPaul Davis Re: [Jack-Devel] OS X jack midi message issues between jack and core midi
On Sun, Jul 15, 2012 at 12:58 PM, Iain Duncan <[hidden]>wrote:

> Hi everyone, following Paul and Stephane's suggestion, I ran
> jack_midi_dump along with a standard os x midi monitor during my sync tests.
>
> Files, including source and screenshot, are at:
> http://industry.flyingnotfalling.com/audio_code
>
> Here is what I've found ( duplicated in link as jack_midi_test_notes )
>
> - system is OS X 10.6.8
> - jack is Jack OSX 0.9 ( beta from Stephane )
> - test app compiled with:
>   g++ -o jack_midi_1 -framework Jackmp jack_midi_1.cpp
>
> - occasional clock messages are either dropped or duplicated
> - if you look at the top of the screen shot, you can see:
>   - 24 clock messages per quarter in the jack_midi_dump output
>   - a duplicate clock message at 9:38:838 and 9:38:839 in the midi monitor
> - when these duplicate messages happen, there is a noticeable lurch in the
> sync
>   with abletone live ( running using jack as audio driver )
>

where are the sysex msgs seen in jack_midi_monitor? they don't seem to show
up in the system midi monitor ....

its hard to read this without a way to establish if the duplicate clock msg
is an extra msg or a mis-timed one ...
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