A free program for Android, by Bass Booster.

The free Fx Music Player + Equalizer is a powerful audio player for Android. With this app, you can listen to all your favorite songs with better sound quality and volume.

It supports many popular music formats and allows you to browse through your music library to play your favorite songs.

This app will also let you adjust the sound effect to give you better sound quality. You can also add an audio equalizer to boost the sound. The audio effect can also be applied to specific songs or playlists.