Saitek X-65F Pro FLIGHT COMBAT CONTROL SYSTEM User Manual page 14

Axis Enveloping
You will see that the X, Y and Rudder axes have a larger axis box than all the other axis boxes and how they have a diagonal line running
through them.
The line running from the bottom left to the top right of the box represents the behavior of that axis;
for example, if you have the line set as the image on the left, the stick will have the same sensitivity
across the whole of the axis range.
In the 2 examples on the left, the line with the flat middle will mean that the stick will be more
sensitive where the curve is steeper at each end of the axis range and less sensitive where the
line is flatter around the center point. The example below means that the X axis will be very
sensitive around the center and not so sensitive at each end of the axis range.
To move the axis curve, simply drag the arrow that is on the top of the X, Y and Rudder boxes;
as you drag the arrow on the slider you will see the curve changing. If you wish to revert back
to the standard axis envelope, simply right-click on the arrow and choose Clear Deadzone
from the drop down list. The axis line will now go to a straight line.
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