Hi all, I'm experiencing tons of xruns and sound saturation when I use zynAddSubFx in combination with freewheeling (live looper). I went through the linux-audio-users-request mailing list and I saw that a low-latency kernel is not the same with a realtime kernel. When I do : uname - a, I have : ... 2.6.16-beyond4.1 #1 PREEMPT Sun May 28 ... So my kernel is low-latency? But, it doesn't seem it is realtime as I have installed no patch (Ingo Molnar patch). It doesn't seem to be PREEMPT_RT. Or is it included in Musix by default? This might be the problem. Another thing I see is that when I run QJackCtl, it doesn't seem to run realtime! Although it does not complain and I have activated the R (realtime) switch. I can see it is not realtime because there is a RT indicator that is not yellow. I tried running as root, and it is the same. I have libpam-modules installed (0.79-4) and I added : /etc/security/limits.conf @audio - rtprio 99 @audio - nice -10 @audio - memlock 250000 (I belong to the audio group of course) (I also tried some optimizations with fluxbox, no 3D accel, disable unnecessary services, increase pci latency for soundcard..) So, I is the problem the lack of realtime patch, or a bad version of QJackCtl? Thank you very much, and sorry for this long post ! Julien