The issue can be visualized like this

sound hardware 
 |
Alsa (only one client allowed) 
 | | | L---Mixxx
 | | L-----Skype 
 | L-------dmix
 |
pulse audio server
| | L---- Firefox 
| L------ Clementine 
L-------- pulse alsa bridge  

The issue is that Alsa only allows one device at a time. Pulseaudio
solves this, unfortunately not all applications have native pulsaudio
output. Some are just two old, using the cross platform portaudio
wrapper or just need direct hardware access for low latency.

There are two workarounds:

Installing dmix, which pretends exclusive alsa access but actually mixes
the samples from mutable applications.
https://ubuntuforums.org/showthread.php?t=1889375

Using the "pulse" alsa fake device, which pretends to be an alsa
soundcard but actual passes the samples to the pulse audio server.

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

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

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