Apple
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How to toggle microphone by a key press in Mac
I recently started using a Keychron K8 keyboard which comes with a dedicated key for Cortana/Siri.
Here's how it can be mapped to turning the microphone on and off instead using BetterTouchTool (which is included in Setapp):
1) Open BTT and create a new keyboard shortcut.
2) BTT is now waiting for you to set a key as a trigger. Go ahead and press the voice assistant key.
3) Next click the + to assign an action.
4) Locate/search and select "Run Apple Script (blocking)".
Paste this code: