EDIT and SOLUTION:
I would like to share the hints of Fons Adriaensen towards my problem described above.
to have zita-ajbridge work properly,
* make shure that your user has realtime privileges, i. e. belongs to the realtime or audio group, and that the maximum priority for audio is set accordingly in /etc/security/limits.conf
* additionally, and here I quote Fons:
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it could be that the maximum priority is set too low.
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On which, he explains:
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Zita-ajbridge will run the thread talking to the ALSA device with a priority that is 10 higher than Jack's callback threads. So if your jack is configured for e.g. 80, and the system limit is 85, zita-ajbridge will fail.
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so, you have to set the priority accordingly, for instance in qjackctl’s advance tab within the settings.
* finally, tell jack daemon to run in realtime mode; in qjackctl’s settings you find a checkbox for that.
while I had set the first two aspects correctly, I didn’t run jackd in realtime mode for certain reasons.
but now, it works.
