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This is not a window!
This is onscreen control, overlay all other windows.
Features: volume control, equalizer, sound mixer, adjusting volume of all sound streams, bass boosting, virtualizer and much more.
Minimalistic fully customizable design ...
Amplify MP3 files on your phone quickly and easily!
So you already set the volume to maximum, bought those cool headphones, but volume on your music or ringtone is still not loud enough?
The solution might be as easy as ...