[ubuntu] JACK and USB soundcard

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http://ubuntuforums.org – I want to use rosegarden for composing music, because of its strong notation editing abilities, but to get sound, I need to use JACK. I have a USB soundcard (uses the CM106 chipset) and I can't start a JACK session when selecting hw:1,0 which aplay -l says is my USB soundcard. When I try to start it, here's the error: Code: 19:20:11.386 Patchbay deactivated. 19:20:11.387 Statistics reset. 19:20:11.391 ALSA connection change. 19:20:11.402 D-BUS: Service is available (org.jackaudio.service aka jackdbus). Cannot connect to server socket err = No such file or directory Cannot connect (Hardware)