NewTek TriCaster 855 - Manual (Page 219)

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This means that the Overlay is applied before that composition is sent to the Switcher. Thus
content in a VI Overlay appears beneath anything displayed via the two (Switcher) DSK channels.
The Overlay selection and Position controls work just like their Input A and B cousins, discussed
earlier (see Section 12.2).
12.4 LIVESET
This brings us to the LiveSet section of the Virtual Input tab. LiveSet allows you to achieve the
look of a large, sophisticated studio setting (Figure 196) within a very small studio space (Figure
195) without the need for external equipment.
Figure 195 Figure 196
LIVESET SELECTION 12.4.1
An information line at the top of the Virtual Input tab lists the current LiveSet (if any) for this
Virtual Input. The default LiveSet simply composites Input A over Input B (if any part of the image
assigned to Input A is transparent, Input B will show through).
Hint: Many virtual sets require LiveMatte settings to be applied to Input A. TriCaster 455 and 855
also support keying of the Input B source.