A free app for Android, by ZipoApps.

Struggling with low audio when calling someone or playing music? Volume Booster for Android is a simple and handy tool that will help you pump up your device’s default sound system.

This sound amplifier will help you improve your device’s audio performance in a fast and convenient way. With a few easy steps, you will be able to adjust the default volume to levels that will suit your needs. You will be able to boost the voice call audio, increase the music volume, and enhance the bass and woofer of the built-in speaker. All of these you will be able to do by sliding the controls up and down.