A free program for Android, by mAppsTech.

Bass Booster & Equalizer is an audio equalizer and bass booster for Android phones. It lets you adjust the sound for all types of audio files, such as MP3, WAV, OGG, and more formats. You can use the equalizer to make your music sound better and the bass booster to make it louder.

It lets you customize the settings for each song.

It lets you save the custom settings so you can use them on other songs at any time. Download and install this handy application today.