How does Smule Sing Audio Effects work?

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There's a Karaoke App on the Play Store and App Store called Smule - Sing Karaoke. I used that app to sing many songs. But now being an Android Developer I really wonder how those audio effects actually work. Is there anything to do with Android/Java or they just write native C++ codes manipulate the audio. How much time or what expertise needed to do something like that?

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