How to use a analog microphone plugged into Realtek ALC1220 chip in PipeWire

I got a microphone connected via a XLR adapter to the rear mic jack of my mainboard. The audio dialog of KDE seems to detect that, as does not mark it as not connected (which it does for the front mic and line in). But selecting the audio device as source does not produce any useful sound. What makes you sure that the mic work,...