Analog Way PULSE2 (MIDRA) - Ref. PLS350 User Manual - Manual (Page 61)

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8.2.25 Special features
live input,
• Background is removed and replaced by another source,
• Title can be keyed (DSK) on Analog or Digital Sources.
To use keying, first select a source in the desired layer:
Layer button > source number button
Then in the main menu, select the Keying/Titling menu.
You now have several choices to key your sources. The Luma Key
and the Chroma Key based on the Luma pixel values and the Chroma
pixel values and for both an additional Titling menu which can be
Layer
Frame
Image live