I've looked for hours on how to record a slideshow with an external USB microphone but I didn't find anything.
Is it possible to change the audio input in Keynote to an external mic?
Keynote Recording – Record Keynote Slideshow with External Mic
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Best Answer
Keynote uses the system sound input device, set in System Preferences → Sound → Input. Choose your preferred connected input device from this list, then start the recording in Keynote.