Midimux & Audiomux Walk Through (video)
"Midimux, and it's counterpart, Audiomux, are two brand new apps that take advantage of the ability to transfer data between your device and your Mac via the USB to lighting/30 cable.
Using Ableton and some old favorites in FunkBox and Magellan, we first take a look at getting set up to send and receive the midi data, before tackling the audio transfers about five and a half minutes in. These apps are so simple to use, it's really a monumental achievement to be able to use your iDevices and Mac so seamlessly together. With this combo, you can now use your iPad or iPhone as a true extension of your desktop DAW, without the need for audio or midi interfaces.
At the time of the this writing, only Midimux is available while Audiomux is in review and should be out shortly."