@waylow and @spikeyxxx Thank you both for your answers. I was just a little bit confused because I thought until now a “Generator Modifier” could be used to speed up an animation with for example “y = 2x” in order to make it run at double speed. I further thought that the “X” in the “Generator Modifier” of a “Driver” takes the value of the “Scripted Expression” as input for “X” and outputs the desired recalculated value. What sense would it make for a Driver to completely ignore the input from the driving property? Of course, I could activate die “Additive” button for calculating the sum of the old curve and the polynomial but I assumed with my question that this button is inactive so that new value replaces the old one.
