It's how much the rate of fire is increased. For example, if you pull 10bps and the ramp percent is set to 50%, you'll shoot 15bps.
If you want to set off and go develop some grand new thing, you don't need millions of dollars of capitalization. You need enough pizza and Diet Coke to stick in your refrigerator, a cheap PC to work on, and the dedication to go through with it. We slept on floors. We waded across rivers. -John Carmack