First post here and it's a question, but hopefully some people have ideas.

I'm trying to route Traktor through Ableton with an Audio 4 DJ via JACK on a friend's computer. When I try to start JACK I get an error "Cannot start Jack server, Please check system preferences or retry after a system reboot."

I can run JACK with the internal sound or with my Ultralite, but the Audio 4 is problematic. Midi sync is fine as well. I have the latest drivers (October 09) installed.

I've googled the problem and the only thing is mention of aggregate devices, but I thought the need for aggregate devices was resolved in an earlier patch of JACK. Anybody have any suggestions?

Mods - not positive what subforum this belongs in - feel free to move it