Sony DFS-700 - Manual (Page 41)

Chapter 3 Basic Operation
Chapter 3 Basic Operation
3-15
Previewing the image after an effect is executed
Select the background image and foreground image, and set up the effect,
then move the fader lever to the opposite end.
You can now check on the program monitor the result of carrying out the
currently set effect.
If a preview monitor is connected, you can check the foreground image on
the preview monitor.