Sony MVS-8000X System User Manual page 837

To set the action for a rewind operation
On the macro timeline, when the [REWIND] button in the keyframe control
block is pressed the action set for the first keyframe is not executed; when the
[RUN] button is pressed, then the first keyframe action is executed.
To execute an action when the [REWIND] button is pressed, it is necessary to
set this action (Rewind Action). To carry out this setting, in the Macro
>Timeline >Timeline menu, press [Rewind Action] to recall the Rewind
Action menu. In this setting screen, use the same setting method as in the
screen for setting an action on the macro timeline.
Alternatively, you can select the reverse arrangement, whereby when the
[REWIND] button is pressed, this executes the action set for the first keyframe,
and when the [RUN] button is pressed the first keyframe action is not executed.
In this case, the Rewind Action setting is still valid.
For details of the setting, see "Setting the First Keyframe When a Rewind is
Executed" in Chapter 19 (Volume 3).
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Macro Timeline