The best option is to use Loopy. It's an app for iPhone/iPad. Just connect a USB from hole in the back, to the phone/ipad, using Apple's camera connection kit.
It not only lets you record into the looping app, but also plays the audio out of the speaker. Furthermore, the app is as good, if not more functional than expensive looping pedals.
Read this forum for more on Loopy HD and AMPLIFI:
http://line6.com/support/topic/22057-a-good-looping-option-if-you-have-an-amplifi/