Sony DVS-7300 User Manual page 184

Wipes
4-100
Chapter 4 Basic Operations for Image Creation
Edge modifications (EDGE): You can apply a border to the edge, or soften
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.
Changing the aspect ratio (ASPECT): This allows you to vary the aspect
ratio of the pattern.
Aspect ratio function disabled
Soft border
Aspect ratio changed