On Wed, April 24, 2013 11:40 pm, Hartmut Noack wrote: Probably not PA, and besides you have tried with PA turned off. Pa was having problems about that time, but normally the problem was after having used it to stream. (it has been fixed since, but I don't know if the fix has been backported yet to either kxstudio or Ubuntu repos (in the works in ubuntu I think) You may wish to use ps to check what jack is running. I have tried Cadence and it has a lot of different ways of doing things. You do have both jackd and jackdbus. Both Cadence and qjackctl are able to deal with either one. However some of the jack apps will start jackd if no jack is running. So if an app starts jackd and then you use qjackctl (for example) to start jackdbus, it will fail because the device is already in use. So maybe try: jack_control exit kill -9 jackd and see if jack starts. When you have this problem. Really, these are shots in the dark. I am trying to think what questions to ask that could narrow things down. -- Len Ovens www.OvenWerks.net