configuration of pulseaudio

Budget
$150

i am looking for someone who knows pulseaudio, alsa and docker. 

Target: 

I want several docker to play music on a soundcard.

Problem:

I want to run several docker in parallel.

In each docker runs a program (for testing purposes aplay) that plays music. 

If you pass the hardware "--device /dev/snd" then only one docker can hear something and the other docker gets an error message that the output is not available right now. Using Pulseaudio it should work but I can't get it to work.

Program is Java so only alsa works?

The software should run on a server without SoundCard. Therefore the final output is loopback. And you should be able to record the output via arecord.

Example see picture. Spotify and Firefox would then each be a Docker.

Files
linuxaudio-pulseaudio-via-alsa
.png

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