Sony MVS-8000X System User Manual page 726

Changing the path type for Curve
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Path Setting
In the Path menu, press [M/E-1].
The M/E-1 menu appears.
Press the Curve path type indication for the Key1 item that you want to
change.
A path selection window appears.
Press the indication for the desired path type, to select it.
OFF: Executing the effect causes no change.
Step: There is no interpolation between keyframes, so that the
effect parameters are updated each time a keyframe is passed.
Linear: Linear interpolation between keyframes, resulting in
constant speed movement.
S-Curve: The rate of change accelerates and decelerates before and
after a keyframe, so that the rate of change is maximum midway
between two keyframes.
Spline: The effect follows a smooth curved path from each
keyframe to the next.
The status area reflects the selected path type.
At this point, depending on the setting for Curve, the effect for Hue and
Xpt is also affected as shown in the following table. In the menu, the Hue
and Xpt settings do not change, but the path type indication is dimmed out.