Volume Booster is not a volume controller, it really is the amplifier volume. It should be able to increase the volume of the audio by about 500% (25 dB).
How to use Volume Booster: Play music in your favorite media player, Enter Volume Booster Pro application, use the slider to adjust the sound level boost, If the effect boost the volume disappears, re-enter the Booster Volume and adjust the boost.
Remember, this is Volume Booster should be used with headphones. Use Booster Volume carefully too high boost can cause damage to the speakers, or cause hearing loss. With this audio amplifier at your own risk agree to keep the developer is not responsible for any damages caused by the Booster Volume.
Volume Booster v1.5 Apk