Helo, I have the exact same problem already described here: https://sourceforge.net/p/wsjt/mailman/message/36693223/
For now i've tried uninstall/reinstall of USB drivers without success. the list shows also very old devices i've uninstaled, but does not updates with the latest devices including ICOm radios like 7300 and 9700. I notice that other software (Fldigi is just an example) correctly shows all the devices (both in and out), so I guess the problem is probably related to some windows registry corruption, but also to the way the software enumerates the peripherals because many other software can see the audio devices correctly. Is there any other idea around? I also suggest to give a look to the code of other apps that works correctly (I mentioned Fldigi that's also opensource), just to understand the reason why this happens on wsjt and not on other sofware. I know wsjt uses qt libraries so it will be quite different in the way this is done. Thanks for your help, Mauro
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