If you want to record audio from your iPad, don't worry: every iPad has a microphone. This article provides information about the microphone for every iPad model ever made.
How to Use Professional XLR Microphones with an iPad
Yes. Since the original, every model of iPad has had at least one built-in microphone. Microphones on the iPad are fairly subtle; they look like small holes poked into the iPad’s body or, on some models, into the camera unit.
The location of the microphone on your iPad and the number of microphones it has varies by model. Here's a rundown of where to find the microphone on every iPad model ever made:
The iPad microphone is used for all kinds of iPad audio recording needs, including: