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Way to send all sounds that come through microphone to earbuds

Is there a way or an app to send the ambient noise picked up by the microphone on a Galaxy S4 to the headphones while using another app (say spotify) is being used? Use Case: I have some noise ...
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How can I play a sound file to the caller when device receives an incoming call? [closed]

I want to receive incoming call automatically, that was I done already, now I want to play my own created sound to my caller rather than using Android's microphone. Is it possible to play our own ...