Set the camera audio source in Final Cut Pro for iPad
The Final Cut Pro camera lets you choose a source for audio input, such as the built-in microphones in your iPad, external microphones with a USB-C connector, Bluetooth® connected microphones (including AirPods), and more.
You can monitor the input volume using the meter at the bottom left of the camera screen.
In Final Cut Pro for iPad, open a project, then tap
in the toolbar.In the camera screen, tap
in the lower-left corner, tap Audio, tap 
next to Source, then tap the audio input.If you don’t see your audio input, make sure the audio device is connected to and recognized by your iPad.
When you’re finished, tap
.
See alsoRecord video with the camera in Final Cut Pro for iPadChange camera settings in Final Cut Pro for iPadApple Support article: If the microphones on your iPad aren’t workingApple Support article: If you can’t connect a Bluetooth accessory to your iPhone, iPad, or iPod touchApple Support article: Pair a third-party Bluetooth accessory with your iPhone or iPad