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Voice Control is Apple’s built-in system for operating the Mac by voice: clicking, scrolling, navigating, and dictating without touching anything. Vox gives it a much closer microphone than the built-in one, which matters because Voice Control listens continuously.
Voice Control and Vox dictation both want to transcribe what you say. Decide which one is doing it before you start, or you will get both.

Setting it up

1

Turn on Voice Control

System Settings, then Accessibility, then Voice Control. Turn it on. The first time, macOS downloads a speech model.
2

Set Vox as the Voice Control microphone

In the same panel, there is a microphone selector. Choose Vox. See Use Vox as a microphone anywhere.
3

Turn off Vox dictation

4

Optionally map a button to sleep and wake Voice Control

Voice Control responds to “go to sleep” and “wake up”, and it has no default keyboard shortcut. TODO: check whether a shortcut can be assigned in the Voice Control command list, and if so, map a Vox button to it.

Why the close microphone helps

Voice Control listens all the time, so it has to decide constantly whether what it heard was a command. A microphone close to your mouth gives it a much better signal against room noise, which cuts down on both missed commands and commands firing when someone else in the room was talking.

Useful commands to know

Voice Control commands vs Vox voice commands

They are separate systems and they do not know about each other. Vox commands are covered in Voice commands. If you are running Voice Control, use its command list rather than Vox’s, since only one of them should be transcribing at a time.

Troubleshooting

Voice Control reads the device list at startup. Turn Voice Control off and on again with the device connected.
Say “go to sleep” when you are not actively driving the Mac. TODO: consider recommending a Vox button mapped to a Voice Control sleep shortcut here.
Voice Control is in dictation mode with a text field focused. Click away from the text field, or say “stop dictating”.