if i start jack bye qjackctl from normal user i receive this errors: JACK: unable to mlock() port buffers: Cannot allocate memory cannot use real-time scheduling (FIFO at priority 10) [for thread -1236161616, from thread -1236161616] (1: Operation not permitted) cannot use real-time scheduling (FIFO at priority 20) [for thread -1227768912, from thread -1227768912] (1: Operation not permitted the jack server starts, but then it tell me messages like this "**** alsa_pcm: xrun of at least 8.570 msec" no problem if i run qjackctl from root. there's something to fix in my configuration? thank you all. bye bobo