Volume booster with control. Amplify sound by up to 600% also bass booster. Sound booster that really works!
https://sound-ultimate.com/
James Farrar
https://sound2up.com/
https://boostmysound.com/
Volume Booster
Click
Volume Booster Plus
Sound Master
Music App
Trevis Diaz
Volume Booster Pro
Adam Larkins