hope this helps: people always figure out the "buttons" when they see them.
it's like "knowing" what Fast Forward is, on a VCR.
FWIW, that concept (a button for Play, and then next to it a button for Fast Forward) never existed before anywhere in the entire history of all civilization (true, i kid you not!) and yet everyone got comfortable with it once they had to use it.
Two buttons is not a challenge except when you try to discuss it blind without having experienced it first hand.
Two options to push to flush big or small is an easier concept that a Fast Forward button next to a Play button.