sox -M f2.wav f3.wav f1.wav out.wav

can you tell me how to realize this command by c code? I look the example4.c. It can Concatenate audio files. But I want to mix two wav files use code. because I want to  use this sox on android. And now I can add echo,echoes, chorus on android with JNI. can you help me ? Thank you very much. I am waiting for your reply online.

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tian
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