Hi all! Florian Schmidt was kind enought to point out that I can increase my system performance by increasing the priority of both the Jack daemon and the IRQ that my trusty'ol bebob device is hitched to. I temporarily gave up on putting the device onto another IRQ and will leaving that up to the kernel developers to sort out; what I am interested in right now is how to increase the priority of IRQ 10 on my system. Florian suggested simply increasing the priority of the 'IRQ 10' interrupt handling process; but on my system, there is no interrupt handling process 'IRQ 10', or for any other IRQ, for that matter. How can I increase the priority of 'IRQ 10' on my Debian based system? Help much appreciated. Carlo PS: upping JackD priority alone took care of 60% of xruns; thanks Florian!