@andrewilley The equalization support requires some effort from the player developer, it's not granted automatically. (For example, Poweramp implements this as MusicFX option). Some of the mentioned players have such support, but it should be activated first (e.g. Black Player - Audio / Select Equalizer / Stock). Android has no easy direct way to enumerate all the audio sessions on the device to equalize. Music apps supporting 3rd party equalizers usually broadcast such audio session once w