Well would you look at that! Went and checked all my guitars and, wouldn't you know it I got one on every guitar. Danged if I know how to use it, but its there.
LOL! You wouldn't think so, but using it properly does take practise! I do use mine for volume swells and sometimes dynamics, but I'm guilty of mostly being a "10" guy.

I think part of it laziness. I've tried training myself to set up my amp volume & tone with the guitar volume on 8 so I could boost just by turning it up to 10, but I seem to have trouble getting back to the right level on the fly. It's too easy to click a boost pedal on & off and have a consistent level difference every time. Hence my laziness...