How to concatenate 2 or 3 audio files in iOS?

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I am newcomer in Objective-C and have experience only 5 months in iPhone development.

What I need:
I need to concatenate 2 or more audio files into one, and export result as aiff, mp3, caf or m4a format.

For example:
First audio file containing "You need", second "download" and third "document".
Every audio part depends on actions from user.

I spent 2 days without luck. That place is my last frontier.

I will very appreciate for a piece of code.

7 Answers
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