Microphone is a simple app that outputs the sound of the built-in microphone.
To avoid acoustic feedback, the app works only when an audio cable is plugged in or a bluetooth audio receiver is connected to the smartphone.
The app is ad-free and has no additional settings, so it is easy to use.
You are also able to leave the app while using.

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The source code is available on gitlab.com: https://gitlab.com/FAvO/microphone.