pulseaudio releasing a device because it is asked to do so, is not a
bug. That is, it seems pulseaudio is acting correctly, if an application
wants direct access to the audio device, Pulseaudio must give it up.
There can be only one one application attached to an ALSA device at a
time. The idea of pulseaudio (and other audio backends) was to get
around that by adding a mixer with psuedo alsa ports. This allows more
than one application to think it has access to a sound card. However,
there are some kinds of applications that need direct access to an audio
device to be useful. In order to accomodate these applications
pulseaudio has a command to release the device or pause itself so that
this application can run. When this happens all applications that are
using pulseaudio to play sound will stop (in various ways). This is not
a bug, but a nessessary feature needed for pulse to exist in the
(semi)pro audio world.

My reason for attaching the bug to mixxx is that this is the only place
I can reproduce it. And it tells me that Mixxx is using the pause
pulseaudio command incorrectly. It should not pause pulse when it is not
using an alsa device or starting jackd on it's own and it does. This is
a bug because mixxx suggests that it can be used for Internet radio and
one of the most common things done on radio is to take phone calls to
air... on a computer that generally means Skype for a lot of people.
Skype needs pulse to work and can be bridged to jackd(bus) but not with
pulse paused.

I will look more closely at musescore and see if it does the same thing
without using jack as my audio device.

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https://bugs.launchpad.net/bugs/1325752

Title:
  All apps become mute when certain apps are opened.

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