Hmm, what do you mean by jack(2)? I didn't know there were 2 versions around but I see at http://www.jackaudio.org/downloads/
that there's a JACK 0.125.0. and a JACK 1.9.12. I have:
ii dssi-host-jack 1.1.1~dfsg0-1 armhf Example of DSSI host
ii jack-mixer 10-1+b1 armhf JACK Audio Mixer
ii jack-tools 20131226-1 armhf various JACK tools: dl, record, scope, osc, plumbing, udp, play, transport
ii jackd 5 all JACK Audio Connection Kit (default server package)
ii jackd2 1.9.10+20140719git3eb0ae6a~dfsg-2 armhf JACK Audio Connection Kit (server and example clients)
ii jackeq 0.5.9-2 armhf routes and manipulates audio from/to multiple sources
ii libjack-jackd2-0:armhf 1.9.10+20140719git3eb0ae6a~dfsg-2 armhf JACK Audio Connection Kit (libraries)
ii libjack-jackd2-dev:armhf 1.9.10+20140719git3eb0ae6a~dfsg-2 armhf JACK Audio Connection Kit (development files)
ii projectm-jack 2.1.0+dfsg-1+b7 armhf projectM JackAudio module
ii pulseaudio-module-jack 5.0-13 armhf jackd modules for PulseAudio sound server
ii qjackctl 0.3.12-1 armhf User interface for controlling the JACK sound server
Under Jessie. I don't know a lot about Jack, seems like a nice idea but I've rarely gotten it to work. This is a convoluted box running off a USB hard drive, not an SD card. I'd be tempted to uninstall the jack from debs and build from source tarballs. Somewhat understandably the debs can be years behind. Yeah, my jack tools looks like it's from 2013.
Did you use the Add button in the patch bay to add stuff or did it just detect everything so it showed up?