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by vertex-four 4378 days ago
JACK is a huge amount more than just a per-app volume mixer, it's basically a virtual audio cabling system. Very handy if you've ever had a need to pipe audio between applications or manipulate audio streams from arbitrary apps.

It's also a complete pain in the arse to get running on Linux, due to the ALSA+Pulse stack being in the way.
1 comments
yellowapple 4378 days ago
If your goal is to use Linux for audio production (or some other use case where JACK would be necessary), it helps to use a distro like Musix or Ubuntu Studio that already takes care of that "get running" part for you.

JACK is pretty complex, but infinitely useful; one of those things I end up installing long before I decide I actually need it.

link