How can I connect my keyboard to an Apple iPad?

If you have a keyboard that is "class compliant" USB-MIDI (which includes all Casio keyboards made since 2010), then you can connect the keyboard to an Apple iPad. To do this, you need to obtain Apple’s own "Camera Connection Kit", which allows USB-MIDI keyboards to be used with apps such as GarageBand. If our keyboard is not working with a particular Apple iPad application, then it is likely because the app is not functioning, not because of our keyboard. A test using GarageBand on the iPad will confirm this