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Filter Input is a ProtoFlux node that is usually generated by first equipping a ProtoFlux Tool, dragging a wire from output of any type except Impulses on a ProtoFlux node, and then hitting secondary.
Inputs
Input (Generic)
Any value data type
Outputs
Outputs to the node's visual UI without an actual value. It displays the value as a string and in the case of non primitives displays some information.