Implements a framework (portman.py) and a sample application (example.py).
To run the example application: pw-jack python3 example.py
The example application picks an arbitrary stereo speaker on your system and allows you to mute/unmute up to 5 arbitrarily-selected applications playing audio.
The example application is intentionally simplistic; see orchestra.py and streaming.py for realistic applications that require special hardware (Scarlett 4i4 and Blue Yeti).
Only tested on a system using Pipewire, so if you use JACK or Pulseaudio directly, it will probably not work.