The In command in the expression editor inserts the token at the insertion point in the editing pane. This token generates a ramp from 0 to 1 between the start and end frames. You
can then combine this function with other operations to create ramps between any two numbers. Replace the dummy arguments
as follows:
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Replace with an expression for the start frame of the ramp. The value is 0 before this frame.
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Replace with an expression for the end frame of the ramp. The value is 1 after this frame.
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Replace with for a linear interpolation between 0 and 1 or with for a spline (curved) interpolation. You can use the submenu to insert these strings.
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Example
5*ease_in(10,90,LinearInterp)+2
Generates a linearly interpolated ramp from 2 (5 * 0 + 2) to 7 (5 * 1 + 2) between frames 10 and 90.