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Macros are not technically a node. Instead, they are a group of nodes that act as a single node.
Macro Introduction
Macros can be used to combine multiple nodes and expose a user-definable set of controls. They are meant as a fast and convenient way of building custom nodes.
Usage
To create a Macro, select the nodes intended for the macro. The order in which the nodes are selected becomes the order in which they are displayed in the Macro Editor. Right-click on any of the selected nodes and choose Macro > Create Macro from the contextual menu.
Select the nodes to include in the macro
Macro Editor
The Macro Editor allows you to specify and rename the controls that are exposed in the final macro tool.
In the example below, the tool is named Light_Wrap at the top. The Blur slider for Matte Control 1 is enabled and renamed to Softness, as it will appear in the Inspector.
The Macro Editor