Sony DVS-9000 System User Manual page 668

Specifying the effect execution direction
To specify the effect execution direction, press the [REV] button, turning it on
(for reverse direction) or off (for normal direction).
To execute the effect so as to alternate the normal and reverse directions, press
the [NORM/REV] button, turning it on.
When the [REV] button is off: The effect is executed in the direction from
When the [REV] button is on: The effect is executed in the direction from the
When the [NORM/REV] button is on: Each time the effect is executed, the
Executing an effect up to the next keyframe
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Repeating an effect
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Executing Effects
the first keyframe to the last keyframe.
last keyframe to the first keyframe.
direction reverses.
Press the [STOP NEXT KF] button, turning it on.
Press the [RUN] button.
This executes the effect as far as the next keyframe. When the [REV]
button is lit, it is executed as far as the previous keyframe.
Press the [EFF LOOP] button, turning it on.
Press the [RUN] button.
This executes the effect repeatedly, from the first keyframe to the last
keyframe.
When the [REV] button is lit, the effect is executed in the reverse direction.
To stop the repeating effect, press the [EFF LOOP] button, turning it off,
or press the [REWIND] button.