[linux-audio-user] SB Extigy with Jack

Hi! I'm using the Soundblaster Extigy USB-Soundcard and would like to get JACK working. AFAIK ALSA is working. But if I start qjackctl and after that ardour or rosegarden4, the output is *really* noisy. I've attached the qjackctl output messages and I'm using Debian/unstable with a compiled 2.6.14.3 kernel. I'd like to provide you some more information, but I have no idea what the problem is, so I don't know, what to post. Thanks in advance to everyone who can help me... Jakob Rohrhirsch qjackctl output: 18:31:12.067 Patchbay deactivated. 18:31:12.106 Statistics reset. 18:31:12.165 Startup script... 18:31:12.165 artsshell -q terminate 18:31:12.181 MIDI connection graph change. 18:31:13.066 Startup script terminated with exit status=256. 18:31:13.107 JACK is starting... 18:31:13.108 /usr/bin/jackd -R -dalsa -dhw:0 -r44100 -p1024 -n2 -P -S 18:31:13.132 JACK was started with PID=5848 (0x16d8). jackd 0.100.0 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. loading driver .. apparent rate = 44100 creating alsa driver ... hw:0|-|1024|2|44100|0|0|nomon|swmeter|-|16bit control device hw:0 configuring for 44100Hz, period = 1024 frames, buffer = 2 periods nperiods = 2 for playback cannot use real-time scheduling (FIFO at priority 20) [for thread -1228801104, from thread -1228801104] (1: Operation not permitted) cannot use real-time scheduling (FIFO at priority 10) [for thread -1237189712, from thread -1237189712] (1: Operation not permitted) 18:31:13.334 MIDI connection change. **** alsa_pcm: xrun of at least 32.720 msecs 18:31:15.400 Server configuration saved to "/home/jakob/.jackdrc". 18:31:15.402 Statistics reset. 18:31:15.514 Client activated. 18:31:15.514 Audio connection change. 18:31:15.517 Audio connection graph change. subgraph starting at qjackctl-5845 timed out (subgraph_wait_fd=10, status = 0, state = Triggered) **** alsa_pcm: xrun of at least 25.410 msecs cannot use real-time scheduling (FIFO at priority 9) [for thread -1225634896, from thread -1225634896] (1: Die Operation ist nicht erlaubt) 18:31:15.592 XRUN callback (1). 18:31:35.818 XRUN callback (2). delay of 26106.000 usecs exceeds estimated spare time of 21284.000; restart ... **** alsa_pcm: xrun of at least 16.877 msecs 18:31:35.901 XRUN callback (1 skipped).