How to Turn Up the Volume on a Kindle. While the Kindle's primary function is to read e-books, some models of the device also feature MP3 playback. Whether you're using it to relax, get in the ...

To turn on the microphone in either scenario, make sure your microphone is set as the default and has its volume turned up.

This will open a simple recorder. Turn up the volume on the slider at the bottom and you should be able to hear yourself through your computer speakers when singing into the microphone.