Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 216)

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4. Delete the connection between the top Source bar and node 3, and then connect the
bottom Source bar to the RGB input of node 3.
Immediately, the image in the node thumbnail and Viewer updates to show the darker,
underexposed version of the HDR image. This is because, by default, the Layer Mixer is
mixing 100% of node 3 over node 1.
A node tree that uses a Layer Mixer node to mix two Corrector nodes, each connected to
separate Outputs for the regular and highlight exposures.
The second Source bar, next to the menu command
that creates it