All iPads have a microphone, and they can all record audio out of the box. Apple provides a free app to get you started. Voice Memos is available on every new iPad and iPhone, and is a free download from the App Store. You can also record audio in several other Apple apps and a collection of third-party apps.
How to Record Your iPad Screen with Audio
The Voice Memos app has been around since iOS 3, but it has been redesigned in iOS 12. The easiest way to record audio on the iPad is with the Voice Memos app. Voice Memos makes it incredibly easy to record audio. Open the app and make sure your iPad is close to the source of the sound you want to capture.
To create a new recording in the Voice Memos app:
Tap the red Record button in the sidebar of the Voice Memos app.