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Set the Start after setting to Never.
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Security & Privacy
Privacy:
Microphone: Make sure to allow just:out to access the Microphone. Otherwise there will be no audio at the output during a Live Event.
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Full Disk Access: Make sure to activate Full Disk Access for just:connect and just:out. Otherwise setting changes will not be saved, causing all kinds of unexpected behaviour while using the applications.
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Sound
Sound Effects: Make sure to select the speaker of your Mac (“Mac mini Speakers” in the case), to play sound effects using this device. The same output is used by the just:live and just:play user interface (run in Just Control)when playing videos in the preview windows.
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