Which round green buttons on the side adjust velocity? I have a launchpad MKII and I'm trying to increase the pad velocity.

Hey Mixcrafters (is that the term we use?) I am brand new to the Mixcraft gang (just got MC 8 Pro) and I have been poking and prodding around the settings, forums and manual. One thing that I came across, which is not documented anywhere I can find, is how incredible the Launchpad Mode 2 is. When y...