When it comes to recording audio, there are many options available to iPad users. You can plug in directly using an adapter like the iRig Pro. You can set up a microphone that is connected to the iPad. You can even record right from the tablet’s internal microphone, which I don’t suggest doing.
Apogee has a device that comes with a high-quality built-in microphone, and also features instrument inputs, a headphone output, and a USB connector so you can plug into your computer as well.