NewTek TriCaster 300 - Manual (Page 145)

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8.1.2 PROGRAM AND PREVIEW
Figure 121
The Program and Preview rows are extended with buttons labeled V1 to V5. These buttons
control display of the composite output of TriCaster’s Virtual Inputs (Chapter 11).
8.2 VIDEO LAYERS
The concept of video layers is central to understanding how TriCaster’s Switcher and Transition
controls relate to one another, and how they combine to form the video seen on Program Out.
The Program row selection determines the dominant video stream of
the Background (BKGD) video layer – the bottom-most layer of the
composition shown on Program output.
Other sources may be mixed into the Background layer at times, as
you apply LiveMatte, or see portions of an incoming Preview row
video source during a transition.
Normally, the Preview row selection determines which source is
queued up for display in the Background layer by the next (BKGD)
Take or Transition operation.