Left Toolbar > Math Nodes > Rgbo Scale
The RGBO Scale node allows to scale rgbo values. RGBO output: Red Green Blue Opacity.
On the left toolbar choose Point Nodes > Rgbo Scale
Drag the Rgbo Scale icon into the Node Graph.
Connect the Output .
rgbo_a A RGBO type.
number A number type.
result A RGBO type.
These attributes are exposed as input by default. Right-click the Node to hide the attribute as input and set the point values manually. Default R:0.0, G:0.0, B:0.0, O:1.0
rgbo A
rgbo B