There's a small circuit board plugged into the top of the accelerator pedal which sends messages to the ECU regarding throttle position.
This is what the pedal box modifies (amplifies) the signal of, on a sliding scale depending on how sensitive you set it.
The factory settings should be renamed
Really really crap
Crap crap
Not quite as crap
As compared to the pedal box settings which range from
Oh, there really is 280 lb ft of torque after all
To OMFG!