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bbfa235
(Get the code!)
I installed both vlc and mixxx.
I can run a video on vlc, a youtube video and musescore all at the same time. My musescore is the same (or works when set the same). Anyway all three run. The audio from all three mix. SO far so good.
Now start mixxx... I already have jackdbus running and use jacksink as my pulse backend/device :) I know not very stock. Anyway, mixxx pretty much kills all the pulse sound. OK, mixxx is using jack directly and not trying to go through pulse audio at all. Pulse just looks like any other jack client and so the next thing is to try mixxx with another jack client... Hydrogen is handy and is not stopped by mixxx. Hmm. OK, lets see if /usr/bin/mixxx is a script that maybe runs pasuspender... No it is a binary.
I would still say the problem is with Mixxx. I suspect (but don't know how to find out) that mixxx sends a suspend to pulseaudio when it attempts to get it's output set up... Either start jack or grab the alsa port... unfortunately it does not let go of it after it has gotten it's port (as it should... at least jackdbus does so)