What does does punch control actually do?

[Dragonfueled]

I mean not basically but actually. I was thinking that it slows the throttle sesponse kinda like rolling on the throttle slowly.
I ask cause I never used to use it before till i tried it today. I have my e revo on 4s with a medusa at 100% punch control and I love it. I its high but man it makes it so much more driveable. My motor and batteries run cooler also. Still pulls 20mph wheelies but its allot better. So anyway how does it work? I can gear for higher to speed and still be able to control it.