a) The effect of a spotlight falling on a video scene, and the switcher feature that allows this to be accomplished. On the AVC, the spotlight control adjusts attenuation of the A bus video. A typical spotlight effect is obtained by selecting the same source on both buses, a soft bordered circle wipe, and using size and position control. Many other effects are also possible with this feature. b) A highlight effect produced by a fullstrength video signal shaped by a wipe pattern and an attenuated (darkened) signal from the same video source. This is activated by selecting spotlight on the M/E effects group of buttons, and adjusting spotlight control on the pattern adjust group of controls to darken the desired area.