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What are program output and preview?

To understand the difference between Program and Preview, read on.

Program output is the on-air video output of the system, which can be live switched and live edited. 

Preview is a sketchboard output of the switcher where you can sketch different compositions, text overlays, and lower thirds. This shows the scene that will go on air (program) when the next manual transition occurs.

Manual transitions can be invoked either by dragging and dropping the Preview to Program, or by tapping the Preview-> Program button.