A free app for Android, by T2400app.

It is a simple app for Android that turns any microphone into an echo. It can turn your microphone into an audio output so you can hear your voice, just like in a microphone booth. You can adjust the microphone gain and frequency, and the sound is transmitted to the audio output, so you can hear it as an output.

You can set it up to play music from your device. It can also be used as an audio playback for mp3s, oggs, flac, m4a, wav, wma, wv, and aac files.

It can play any audio file that you put in the mic, and you can record the output as a mp3, ogg, flac, wav, wma, wv, and aac file.

You can use this app with an Android device and use it as an audio output device. You can also use it with a laptop or desktop.