Sony MVS-8000 User Manual page 148

Executing an effect up to the next keyframe
Use the following procedure.
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Repeating an effect
Use the following procedure.
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148
Executing Effects
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.