Hello, I'm unsure how JACK works, but it seems it's not really like pulseaudio: it's not easy (or possible ?) to grant JACK access to several different users, which makes Debian approach (using a 'mpd' user) not so suitable.
Some more documentation around this would have been indeed welcome. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org