Fade In, Hold, Fade Out Value
To create an animation behavior for objects, where a trigger smoothly moves a value to a target value, holds that value for a time and then smoothly moves the value back, we use a MonoFlop and we add the HoldTime with the Filter In time together so the MonoFlop outputs True or 1.0 for the holding time plus the filter in time. The output signal of the MonoFlop triggers the Switch to change the Filter Time in the Filter node.