n my new MacOS Catalina there was a microphone problem with MxMC
Here is the solution
MxMC Microphone under Catalina:
Intercom via microphone in MxMC does not work
MacOS Catalina requires the release of the microphone for each application.
Normally, when starting the program a query is added and access can be granted under
Apple > System settings > Security > Privacy - Microphone
Can be viewed and changed.
If the MxMC is not in the security settings, you have to execute the following procedure
opens the terminal (Terminal.app in programs)
MxMC must be closed at this time.
execute this command in the terminal: open /Applications/MxManagementCenter.app/Contents/MacOS/MxManagement
now MxMC is started and a PopUp appears if MxMC may access the Micro