How to record from an external iPhone app into garage band?

I have an eternal app called Banjo Legend and I want to incorporate that app into my garageband song I'm doing but I dot know how to get the audio recording to record directly into garage band from an external app like that. It is important that i figure out a way to do this because that app is key to a song i'm working on. Anything will help

Heres the link for help http://www.apple.com/...arageband/ Hope this helps and Good Luck!

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