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Vox installs a virtual microphone on macOS. Any app that lets you choose an input device can record from your Vox device, including apps that have never heard of Vox.
This is Mac only. iOS does not allow it. See Vox on Mac vs iPhone.

Selecting it

1

Make sure your device is connected

Open Vox and check the connection state.
2

Open the other app's audio settings

Look for Input, Microphone, or Audio source.
3

Choose Vox

TODO: confirm the exact name that appears in the device list, and use that exact string here. People search for the string they see.
The microphone activates on demand. When no app is listening, it does nothing, so leaving it selected costs no battery.

Where you will find the setting

Setting Vox as the system-wide input in System Settings affects every app at once, including ones you would rather leave on the built-in microphone. Setting it per app is usually the better move.

Troubleshooting

macOS caches audio drivers aggressively. Quit and reopen the app that is missing it. If it is still missing, restart the Mac.
Check that the device is connected in Vox, and that the app has microphone permission in System Settings, then Privacy and Security, then Microphone.
TODO
TODO: this is a known shape of problem with audio drivers. Say what to do.