It's apparent you've got JACK and ALSA installed and working, but what about PulseAudio? I'm assuming installed, but perhaps not all the relevant bits.
Can you install and try to start pavucontrol
If you get "Establishing connection to PulseAudio. Please wait...
" Pulseaudio definitely isn't running.
If it starts displaying mixer controls, but they do not
have Jack sink/source items - similar to those shown here - you may be missing some modules.
To check for the right modules:
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fawkes~$ pulseaudio --dump-modules | grep jack
module-jack-sink JACK Sink
module-jack-source JACK Source
module-jackdbus-detect Adds JACK sink/source ports when JACK is started
If you don't get those jack modules, check you have pulseaudio-module-jack
I'm currently running the KXStudio 'bits' on top of KDE Neon. Underlying it all is Debian. However, I know the KXStudio repositories don't require absolutely everything needed to make it run optimally. Cadence
is a nice little audio manager and launcher when you're only sometimes needing the power of Jack. Especially when you get this particular bit running properly.
The full list of pulseaudio modules I have installed is as follows:
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pulseaudio pulseaudio-module-bluetooth pulseaudio-module-gconf pulseaudiomodule-jack pulseaudio-utils libpulsedsp libcanberra-pulse libpulse0 libpulse-mainloop-glib0 libpulse0:i386 pavucontrol libqtmultimedia5-plugins
I don't know if having other PulseAudio modules installed may
be a problem.
I note a zero configuration one, which I'd suspect might interfere with getting PulseAudio cooperating with Jack. As a rather extreme solution, you could purge and reinstall the pulseaudio
module. Just watch what that's going to remove because of dependencies. Reinstalling it along with all the jack-related modules is just a quick'n'dirty attempt to knock the configuration into a state Cadence and Jack will work with.