Sound booster - volume booster

Sound booster - volume booster is Simple, small, free app to boost your speaker or headphone sound volume. Sound booster - volume booster useful for movies, audio books and music. Use at your own risk. Sound booster - volume booster playing audio at high volumes, especially for a prolonged amount of time, can destroy speakers and/or damage hearing. Some users HAVE reported destroyed speakers and earphones. If you hear distorted audio, lower the volume (but it may be too late).
By installing this application you agree that you will not hold its developer responsible for any damage to hardware or hearing, and you are using it at your own risk. Consider this to be experimental software.

This is not for adjusting the speakerphone volume in phone calls (that has its own boost, I think), but for adjusting the volume of music, movies and apps.