Sound input devices not recognised

My MacPro does not display two devices under sound input and output. I have a Logitech Camera that works properly with images but does not accept sound input. It is also not recognised as a sound input device. Another device is my headset that has worked fine until recently (maybe yesterday). Now both devices are not displayed as sound input, and the headset not as an output device. There are two displays with speakers and a sound device, all working fine.

I have been using both under Monterey for some months. At the very beginning, they both had disappeared from the system. I cannot remember how I repaired them.

Does someone know a remedy?