Turn on the application in the upper right corner and control the sound settings.Main features of Volume Booster Full Pro for Audio and Video:* Volume Booster — amplify volume of music and video. Increase volume in speakers and earphones. If the sound is quiet, you can turn up the volume in this app.* Equalizer — adjust five-band EQ, control intensity of low frequencies, middle frequencies and treble. Use equalizer presets for different music genres, if you need.* Bass Booster — boost bass in music and video. Listen to music with bass boost in headphones to enjoy the sound.* Virtualizer — add surround sound effect to your music. In the Volume Booster Full Pro for Audio and Video application you can use the following settings:— Speaker booster, amp, headphones booster;— Video volume enhancer, music volume booster;— EQ, 5-band equalizer, frequency controller, eq presets, custom equalizer preset;— Bass booster, low frequencies amplifier;— Virtualizer, surround sound effect.For your comfort, there is a notification in a notification bar, so, you can quickly access the application.