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1 "How Install PipeWire": It will depend on your Linux distribution.
If you don't have much knowledge, it is preferable to use a distribution with everything you need installed and pre-configured. Ubuntu Studio seems to meet these premises, although I have not tested it personally.
https://ubuntustudio.org/ubuntu-studio-23-10-release-notes/

2 "How create a bus?". See the documentation should be the first step
https://www.qtractor.org/doc/How%20To%20-%20Create%20Individual%20MIDI%2...

3 "I tried to set the settings as in your screenshot". The screenshot shows WHERE to configure it, NOT HOW. In Output device, assign the device you want to output. In Input Device, the one you want for audio input.

4 "I'll try to uninstall and reinstall qjackctl". I don't think Jack is failing, it just maps the input and output devices.