sudo apt-get install fluidsynth
E: Missgestaltete Zeile 1 in Quellliste /etc/apt/sources.list.d/home:sfztools:sfizz.list (Typ)
E: Die Liste der Quellen konnte nicht gelesen werden.
E: Missgestaltete Zeile 1 in Quellliste /etc/apt/sources.list.d/home:sfztools:sfizz.list (Typ)
E: Die Liste der Quellen konnte nicht gelesen werden.
If you need JACK then apt-get will install it for you when you install fluidsynth.
The errors you get is because you apparently have a file called home:sfztools:sfizz.list in /etc/apt/sources.list.d/ and apt can’t read or understand it.
I don’t think it is related to Jack. The install script seems to be corrupt. Maybe try to get fluidsynth from an alternative source? Add another apt repo or try manually downloading and placing the files (can not assist you with that as my computer will be out of reach for a while, but I hope to point in the right direction anyway ).