How to record electronic drums using garage band (an iphone app)?

So i have a cable that connects from my drum's output to my iphone. I also have a splitter so that I can hear it with my headphones. I can hear everything from my headphones. The thing is that when I record from garageband, all I can hear is my drum noise (external) not the real drum sounds. How can I work this out? Please step by step. Or explain simple as possible. Ty!

You can't just plug drums directly into an iPhone, you need a USB hub just like you would with a computer. Maybe this article will help. They are talking about a microphone, but any input, guitar, drums etc. Would be the same principle.

http://lifehacker.com/...1643737164

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