The Mystery of Fedora Sound

[Jonathan Ryshpan]

Can anyone point me to information about the Fedora/KDE audio system?
I'm running (I think) Pipewire and Pipewire-pulse, which usually serve
me well, but sometimes don't; and I have no idea how sound works on my
system. For example headphones plugged directly into an audio port work
on some configurations and not on others. 

Here's a screen shot of the audio control applet:

             
 * What defines the names?
    - "Audioengine 2+" :  Which are a pair of USB connected speakers
    - "Build-in Audio Pro" :  Which are my headphones
 * Why does Built-in Audio Pro appear twice?
 * What's the difference between "Built-in Audio Pro 1" and "Built-in
   Audio Pro 2"?
 * What are the "Profiles"?
 * What is the function of the circles with dots, which look like radio
   buttons, but can't be because two of them are selected.
 * ...

System Info:
 * Operating System: Fedora Linux 36
 * KDE Plasma Version: 5.25.4
 * KDE Frameworks Version: 5.96.0
 * Qt Version: 5.15.5
 * Kernel Version: 5.18.16-200.fc36.x86_64 (64-bit)
 * Graphics Platform: X11
 * Processors: 8 × Intel® Core™ i7-4790K CPU @ 4.00GHz
 * Memory: 15.5 GiB of RAM
 * Graphics Processor: Mesa Intel® HD Graphics 4600
 * Manufacturer: ASUS

-- 
Many Thanks - Jonathan Ryshpan <jonrysh(a)pacbell.net&gt; If one foot is on
fire and the other is frozen to the floor on the average you are doing
OK.