[seq24-users] Sync Problem using Sooperlooper as jack master and seq24 as slave

[Aurelien <tyr...@fr...>]

Hello
(First of all, sorry, I didn't find the time to write my patch files and
send them here)

I'm exepriencing some troubles, quite weird and not so reproductible,
with MIDI synchronization between seq24 and other stuffs.

I've got to describe a bit my setup to make this mail understandable.

So, I use Sooperlooper as Jack Timebase Master, and as a live-looper, of
course.
I then use seq24 as a a sequencer controlling several instances of
AlsaModularSynth, and one of Tapeutape (a sampler), and also Q Light
Controller (a light controller package).

I've made some patches in seq24 so that I can bind a MIDI control to
start and stop playback.

Now, here is the problem:
Sometimes, all work fine, when I hit the playback MIDI binding or the
space key, sequences begin to play with tempo given by SooperLooper. I
can change SooperLooper tempo, it works really fine.
I mean, starting playback is "instantaneous" (as much as possible) with
the MIDI Signal.

Some other times, it's not the same. When I hit the playback MIDI
binding, there is a really big delay (like 5-10s) before it begins to
start playback.

One important thing is that everything is launched using a bash script,
so that the init sequence is the very same each time I power up the
computer. The only thing changing from one session to another is the
time when I've to unplug/plug my MIDISPORT interface as it's not
detected by udev when plugged at boot.
Another important thing is that when it doesn't work, it doesn't work
until I powercycle the COMPUTER!!!

I know you probably cannot give me a solution or answer with so
"etheral" informations, but I first would like to know in which
direction I should look. I'm not very used with MIDI synchro, and
perhaps it's a really basic error, but I cannot figure out what it deals
with.

Thanks a lot.
Aurélien

-- 
Aurélien