I played with it, but couldn't make it start
jackdbus. The advanced
dialog has a "Server prefix"/Server path (command line prefix) where it
currently says "jackd". It's a list that also contains "jackdmp"
and
"jackstart" none of which works (I get an error "could not start jack,
sorry"). I tried typing "jackdbus" here which also didn't work, with
the
error "Could not connect to the jack server as client".
Settings > Misc > Enable D-Bus Interface.
Not my screenshot, found through Googling. Strangely the screenshot on the official page
for the Misc options doesn't have it and seems rather old/lacking....
http://alien.slackbook.org/blog/wp-content/uploads/2014/01/qjackctl_setup_m…