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)

** Package changed: pulseaudio (Ubuntu) => mixxx

** Project changed: mixxx => mixxx (Ubuntu)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1325752

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

Status in “mixxx” package in Ubuntu:
  Confirmed

Bug description:
  Hello,
  I have a problem with PulseAudio on Ubuntu 14.04 LTS. (This problem is not 
present for Ubuntu 12.04 LTS)

  If you start a music, for example with VLC, a mp4 or a flac (or all
  others files), or a video on Youtube with the Adobe flash player, or
  all program who use PulseAudio.

  If you start a program like Musescore or Mixxx, all others programs
  become mute. It's a bug, because the volume indicate the program have
  a volume of 100% but no sound.

  If you exit Musescore or Mixxx, you can ear all others programs again.
  (Instantly)

  
  On Ubuntu 14.04 LTS the bugs is produced each time.
  If you use pavucontrol, you can see the volume of VLC or others apps freezed 
when Musescore is opened.

  I haven't tested Mixxx on Ubuntu 12.04 LTS so I can't compare, but for
  Musescore it's certain that the problem had appear on Ubuntu 14.04
  LTS.

  (I have installed all updates, and I use only apps on the official
  repository of Ubuntu)

  Version: pulseaudio 4.0
  Thank you.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  valentin  29817 F.... pulseaudio
   /dev/snd/pcmC1D0p:   valentin  29817 F...m pulseaudio
   /dev/snd/controlC2:  valentin  29817 F.... pulseaudio
   /dev/snd/controlC0:  valentin  29817 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-03-28 (65 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  NonfreeKernelModules: nvidia
  Package: pulseaudio 1:4.0-0ubuntu11
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=fr_FR
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  Tags:  trusty
  Uname: Linux 3.13.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 01/20/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0806
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H87-PLUS
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0806:bd01/20/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH87-PLUS:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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