With some help from #irc I've solved the problem with Jamit.
It was actually a problem of xconfig
Strange how a video setting can mess up with audio
but it works now
Again one step forward !
k
ok, an update after playing with the new daw today...
....
The mastering software Jamit is unusaeble on my laptop, when i load it together with ardour and connected trough jack, i get CPU spikes of 100 % and the whole user interface gets incredible slow...
Connected with audacity trough jack it is a 'litle' bit better but still unusable.
...k