Ok i got up to the challenge. But all my enthusiasm stopped at the moment when the xruns started like crazy. So maybe i am not with the most powerful hardware, but imho it is not normal to have xruns generating, on 128 fps and without having any working programs. I tried stopping the alsa-bridge, i tried different configurations, tried softmode and even added Lxde as an alternative WM. Compare this to my current/resent installations:
On TangoStudio with Jack2 (default) and 64 fps i get occasional xruns mostly when certain program is opened or closed. On 128 fps i get no xruns, even if i am on alsa-loop mode.
On ArchLinux (fluxbox) with Jack1 its impossible to get any xruns unless i start Jack on 32 fps (which is pretty stable nevertheless).
I couldn't manage to test KXStudio with alternative kernel, but maybe this could be the root of the issues (Ubuntu Studio 14.04 performs poorly too). Perhaps it should be a good idea to have different kernel like linux-3.16-lowlatency from 14.10 by default.
The only program in which i found issues (on first approach) was Seq24. It doesn't see a bunch of synths, which it should, and the jack transport is not working on Jack1.
PS: Hoping that the next KXStudio will be based on Debian Jessie..........
