in vlc, right click>tools>effects and filters>compressor. adjust threshold to your liking, you don't really need to mess with the other sliders.
edit: you can also go to preferences>audio>normalize volume to: (set what you like)
in vlc, right click>tools>effects and filters>compressor. adjust threshold to your liking, you don't really need to mess with the other sliders.
edit: you can also go to preferences>audio>normalize volume to: (set what you like)