Some boards can be programmed to start ramping at a set bps. and start adding shots to your actual pulls per second. (also programmable) And offcourse there are preset values for certain game types like psp, mill, etc.
Basicly its a way to shoot fast without the effort. Without ramping i can do 14 bps, but cannot sustain that for continued periods. With ramping i could pull 6-8bps continuously and shoot 15 bps (or whatever is legal on the field i play)
Some think ramping is cheating, but if it's allowed, why not use it? It makes things much easier.