Sony DVS-7300 System User Manual page 163

Wipes
Edge modifications (EDGE): You can apply a border to the edge, or soften
Changing the aspect ratio (ASPECT): This allows you to vary the aspect
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Chapter 4 Basic Operations for Image Creation
the edge. It is also possible to soften the applied border (soft border
function).
For a downstream keyer, the only available modification is to soften the
edges.
When you select a border or soft border, the signal which fills these
border portions is termed edge fill.
For the edge fill signal of an M/E wipe, you can select either the
dedicated color matte generator, or the signal on the utility bus. There
are two mattes (1 and 2) and you can also select a combination (mix) of
the two; this is called a "color mix".
For a PGM/PST wipe, a matte signal produced by the dedicated color
matte generator is used for edge fill. The color mix function is not
available.
ratio of the pattern.
Aspect ratio function disabled
Soft border
Aspect ratio changed