[LAU] pipewire, wtf, part 2

Hi!

Found another strange behavior with pipewire:

During my latest issue playing some audio to a certain channel, I took 
pw-play to do the job.
In parallel, audacity should play some background music for the audience.

The two apps cause an interaction I just didn't expect:

Altering the output volume of audacity also altered the output of pw-play!

My steps (to reproduce):

* Configure a command-cue in "linux-show-player"(LiSP) with pw-play as 
the main actor (as shown in my first "pipewire, wtf?" post.

* Open "audacious", play a track, set the volume to, let's say, 30%.

* Open "pavucontrol", go to "playback" rider and watch!

If I run the command-cue in LiSP, pavucontrol shows, that the output of 
pw-play is also reduced to 30%. Raise audacious' volume to 50% and hit 
the command-cue, again: pw-play's output is also raised to 50%.

I don't think this should happen…
Is this a bug or a feature?

Instead of using the command-cue in LiSP, you can also use that command, 
directly.

I'm glad, the audio-cues of LiSP are not affected… I also haven't seen 
more applications that interact in that way, but audacious and pw-play 
will not be the only two where this behavior is shown…

Greets!
Mitsch
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