GRASS VALLEY EDIUS VERSION 5.1 User Reference Manual page 555

Creating Video Composites
Figure 648. Key Frame Setting Tab
Fade Settings
Enable the fade setting to add fade in and fade out effects to the luminance
key area. The fade In and Fade Out durations are designated by entering a
number of frames for the effect.
KeyFrame Settings
Enable this option in order to increase or decrease the luminancekey effect.
Click on the line at the points to add key frames and drag the points to
change the effect setting.
Select "Linear" or "Curve" as the manner in which to apply the effect
adjustments. See Figure 649 for an example.
EDIUS — User Reference Guide 555