This is a delayed version of Curve 1. It uses the clipper of the "Input" position to control when the curve is active. In this case, the clipper runs from about 50% of the "Input" range to 100%. This places the curve in the later half of the total input range.
The clipper is used to drive the importance of the "Range Input" intermediate position which is driven by a bias. So the only external control is accomplished by controlling the importance of the "Range Input". This is a common design practice.
The "Range Input" is then used to control the remainder of the design (similar to Curve 1).