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Willow Voice handles the transcription, Vox provides the microphone and the button.
1

Turn off Vox dictation

Otherwise both tools transcribe at once and you get the text twice. In Vox, open Settings → Basic → Dictation and turn off Built-in dictation. See Use another dictation tool instead.
2

Set Vox as Willow Voice's microphone

In Willow Voice, open Settings → Microphone and choose Vox from the list of input devices. Willow Voice keeps using that microphone whenever it is available. In Vox, make sure Settings → Basic → Other apps → Use Vox in other apps is enabled. See Use Vox as a microphone anywhere on Mac.
3

Add a hotkey a Vox button can send

Willow Voice’s default hotkey is the Function (fn) key on its own. In Willow Voice, open Settings → Hotkey Binding and add a key combination that does not use fn, such as Ctrl + Option + D. Willow Voice allows up to four hotkeys, so fn keeps working from the keyboard. A combination must include at least one modifier key.For one-press dictation, assign a separate hotkey to Hands-Free Mode in the same section. Pressing it once starts dictation, and pressing it again stops and inserts the text.
4

Map a Vox button to it

In Vox, open Buttons in the left sidebar and select a button. Set its Press gesture to send the Hands-Free Mode hotkey. To talk only while the button is held, set its Hold gesture to send the dictation hotkey instead. See Map shortcuts to your buttons.

Troubleshooting

The dictation hotkey only records while it is held, and a button Press sends a quick tap. Map the button’s Press to the Hands-Free Mode hotkey, or map its Hold gesture to the dictation hotkey.
Check that Vox is connected and that Willow Voice has microphone permission in System Settings → Privacy & Security → Microphone.
Vox dictation is still on. Turn it off.