Hi Christoph,
Some extra info:
In case your system does allow real-time, it could be
that the maximum priority is set too low.
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.
Ciao,
--
FA