objective c - How can I mix 2 audio files into 1 file -

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I am creating an audio player like the garage band.

For me, the audio file format at runtime in 2 different file

Example:
At the same time, the user pushes drum buttons and violin buttons .
Then user will press disk button to save that tune.

So how did I mix them in 1 file (asynchronous and correct time period)? This is very trivial with Apple's new animation engine, which is exactly designed for this kind of situation.

and watch the WWDC video about it ...

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