Are you interested in performing in a public speech or singing but don't know how to go about doing it? With My Microphone - Sound Amplifier & Voice Changer, you can use your phone as a real microphone or megaphone and record the sound that comes from it to help you with your speech or song performance. You can use the My Microphone app to perform in public. With it, you can record your voice and use the audio from the device as a real sound amplifier to amplify your voice.