Open the Live Mixer.
In the Sources section, add a source with the 
button.
In the Editor section set the Input to Live
Select one of the four NDI sources in the dropdown menu that appears.
For each source, it is possible to modify colorimetry, to crop, to apply soft edges, mask or keying.
It is also possible to use the same live media in different sources to create different presets of configurations to it.
Create 4 sources for all live sources.
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