V-1HD⁺: Set Up Titles or a Green Screen with the DSK (Downstream Keyer)
The following information is from the V-1HD⁺ Reference Manual.
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Note that you can also use the Picture in Picture as an additional Luma or Chroma Key, the advantage to this is you can resize the window all the way up to full screen.
More information is in this article: V-1HD⁺: How to Set Up and Use Picture in Picture Overlays