On 11/3/20 11:31 PM, Tim E. Real wrote:

Tested MusE with Jack 1.9.14:

Successfully sent a 1536 byte sysex from one MusE instance to another.

Has Jack midi sysex length finally improved? Yay!

It sure didn't seem to be working years ago when I did the MusE sysex stuff.

Thanks.

Tim.

MusE sequencer project.

"Bonus question: is it possible to be warned when jack is dropping sysex
messages?"

I forgot to mention, in MusE we call jack_midi_event_reserve(),

�and if it fails, look for this message:

"MidiJackDevice::queueEvent ME_SYSEX: buffer overflow, sysex too big, event lost"

I did not see the message in the test above. IIRC years ago it would happen.

Tim.

And... sorry, a couple of more points:

The test above was at 128 jack buffer size.

Also, a slightly embarrassing but relevant gory detail about MusE:

If latency correction is enabled (see Settings), be aware of a caveat:

It works great! But an unfinished detail means that the first brief

�moment of audio or midi playback will NOT be heard.

This is because I will need to queue a small segment of playback

�BEFORE the transport starts. That's not done yet.

It means if you press play and there is a sysex or any other event

�placed right at that exact starting point, it will NOT be played.

Therefore, please place the red 'play head' cursor slightly BEFORE

�the desired start point, say about one quarter bar or more,

�before pressing play. All should be fine after that.

Thanks.

Tim.

On 11/2/20 6:25 PM, Alexandre DENIS wrote:

Hi,

I try to understand why sysex go through jack MIDI sometimes, and
sometimes they are lost. I am aware that jack has a limit for the
maximum message size per period, but I am playing with program dump of
my Nordlead which are only 139 bytes -- definitely not huge.

I am running jackdbus with a2jmidid, through Catia. My system is Debian
+ kxstudio.

When I try an application with native jack MIDI, such as Reaper (with
jack backend) or MuSE, I can record sysex successfully, but when I play
it, it never reaches the hardware.

With applications using ALSA sequencer (tested with qtractor and
Rosegarden), I can record and play successfully sysex using ALSA.
However, I cannot record nor play sysex when connecting jack MIDI ports
instead (jack MIDI wrapper ports from a2jmidid).

Is this the expected behavior? Are we stuck with ALSA when we are
dealing with sysex messages?

Bonus question: is it possible to be warned when jack is dropping sysex
messages?

Thanks!
-a.

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