• I am thinking of the useful feature present in the MPUI video player (mplayer for windows) that can enable volume boost to impressive levels (not from the volume slider, but just from the mouse scroll).
  




• In L/ubuntu I use VLC for the same purpose - normally up to 200%.

• I have found this and this related questions that imply overall volume boost and do not specify the desktop environment, which usually means they are Gnome-Unity specific.
  I think the answers related to using the volume properties in order to boost overall volume above 100% is useful in LXDE/Lubuntu too, as Pulseaudio Volume Control can be used in LXDE.
  

But I would like to know if there's a way to do that with mplayer/smplayer - to get more boost.

I thought that maybe mplayer would do in Ubuntu/Lubuntu at least what it can do in Windows. But how?