[Ether]

Perhaps you are referring to contouring the joystick output exponentially?

Here is a joystick exponential mapping function which maps a Joystick value between 0 and +1, inclusive, to an adjusted value in the same range:

Joystick_adjusted = (1-b^Joystick)/(1-b);

For range -1 to 0, use this:

Joystick_adjusted = -(1-b^-Joystick)/(1-b);

b≠1 is a tuning parameter.

Example graph below with b=10