Sony MVS-8000 User Manual page 340

At the first transition completion point, if you move the image with the
positioner, the transition appears as in the following figure.
Transition mode "frame in-out V"
This mode is specified when creating a transition effect in the vertical
direction.
In this mode, in the state at completion of the first transition, you can move the
image with the positioner in both horizontal and vertical directions. The image
at the transition start point and end point also moves.
The description is of an example of creating an effect such as the following.
340
Overview
First transition
Transition start completion point
Effect execution
First transition
Transition start completion point
Effect execution
Transition end
Image created
by interpolation
Background A
Background B
Transition end
Image created
by interpolation
Background A
Background B
State before
modification