Datavideo TVS-1200A Instruction Manual page 32

The last layer to be imported to the virtualset will be the talent layer (Source A or C).
Virtualset Maker allows the user to place two talent layers on the studio layer. However,
Sources A and C are one-time selections so they will not be shown in the "Select Layer Type"
dialogue box after they are selected.
Please note:
The TVS-1000A supports only one talent layer (Source A), so even if your virtualset is designed
for the two-talent scenario (Source A and Source C), only one talent will appear on the TVS-
1000A system.
The TVS-1200A supports two talent layers (Source A and Source C), but if your virtualset is
designed for the one-talent scenario (Source A), only one talent will appear on the TVS-1200A
system.
After importing the talent layer, the user will find that there is a white frame enclosing the
talent. This is the confinement defined for talent movement, in other words, it is the coverage
of a camera lens during actual shooting.
If you have already placed all six layers on the studio
layer, the screen option (Source B) will then no longer
be shown on the "Select Layer Type" dialogue box.
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