Blackmagic Design DaVinci Resolve Advanced Panel - Manual (Page 208)

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Key Mixer Node
The Key Mixer node allows you to mix the key outputs from multiple nodes and combine them within
the Key Mixer node in order to produce a composite key signal. To create a Key Mixer node, right mouse
click within the Node Graph display and add a Key Mixer node by selecting the option within the ‘Add
Node’ section of the menu.
The Key Mixer node comes with two inputs when first created, but additional ones can be added with a
right mouse click within the Node Graph display and choosing the option ‘Add One Input.’
To adjust the parameters of each node, which is fed into the Key Mixer node, use the Input section of
the Key tab. The Gain Control within the Post Mixing section can be extremely useful for adjusting the
amount of effect the final correction will have within the image.
Layer Mixer
Key Mixer Node