Does need testing with rdepends:
$ apt-cache rdepends qjackctl qjackctl Reverse Depends: tuxguitar-jack whysynth vmpk ubuntustudio-audio tuxguitar-jack rumor rosegarden qsynth phasex jackd2 jackd1 djplay ardour-i686 ardour
Does need testing with rdepends:
$ apt-cache rdepends qjackctl audio
qjackctl
Reverse Depends:
tuxguitar-jack
whysynth
vmpk
ubuntustudio-
tuxguitar-jack
rumor
rosegarden
qsynth
phasex
jackd2
jackd1
djplay
ardour-i686
ardour