Dissolves

A Dissolve is a gradual fade between video sources. For a Background transition, the video signal on the Background bus and the video signal on the Preset bus are mixed together until the Preset bus video signal completely replaces the Background bus video signal. During the transition, both the Background bus and the Preset bus are on-air. Only after the transition has completed do the crosspoint selection flip-flop between the buses.

Figure: Dissolve Transition