Hello! I was watching a tutorial about creating custom brushes, and somewhere along the tutorial, the instructor brought up the trails feature within the modifiers sub-palette within the brush palette. (brush palette -> modifiers sub-palette -> trails). I understood what trails does, but the few options below it is what I am very confused about.
The buttons are the ones I typed below
(GPosition - GOrientation - LPosition - LOrientation)
I have read the little pop-up menu that appears as you hover over the buttons and yet my inexperience with 3D software does not allow me to comprehend the explanations unfortunately 
GPosition = The G Position slider controls the Trails global position falloff.
GOrientation = The G Orientation slider controls the Trails global orientation falloff.
LPosition = The L Position slider controls the Trails local position falloff.
LOrientation = The L Orientation slider controls the Trails local orientation falloff.
I of course tried to experiment with these different features to figure out what they do, but I can’t really see a difference when I set any one of these sliders from 0-1. If anyone knows what these options do, I’d greatly appreciate it if you could help me understand 
. Thanks!