# Understanding the Driving Curve in the Bone Driven Controller node

Hello everyone. I`m quite new to UE4 and blueprints, so please forgive me if I make some obvious mistakes here.

I`m trying to understand how the Driving Curve is mapped to both the incoming and outgoing values in this node, because I`m having a hard time noticing the effect it has (whereas the multiplier value is very obvious).

I have a bone that rotates on one axis depending on the rotations of its parent. I`ve set it up so I`m reading the correct rotation axis, and driving the correct target rotation axis. I created a Curve in the Content Browser, and selected it in the node to be used as the driving curve.
To get started, I created three keyframes in the curve. One at t=0, with a value of 0, one at t=-90 with a value of 90, and one with t=90 with a value of 90. My reasoning was that since I`m generating an angle from an angle, rotating the driving bone by 90 degrees would rotate my driven bone by 90 degrees. Likewise, rotating the driving bone by -90 degrees also would rotate my driven bone by 90 degrees. However, that`s not what I`m seeing. I hardly see any effect on the driven bone. I`ve tried different values on my keyframes, but can’t seem to get an effect I’d be able to understand clearly.
So, I guess I will have two questions at this point…

1. How does the Time (x-axis) on the curve relate to the driving transform axis in this node? Is it a 1-1 relationship? (i.e. 1 sec = 1 degree, in my case).

2. Does the node perform internal conversions when the transforms are not equivalent? Say, driving the Y translation axis with an X-axis rotation. Does the node perform an internal degrees to radians conversion?

Any help understanding how to use these curves will be greatly appreciated. The reason I decided to explore their use (instead of just relying on the multiplier) is because I have a few bones in my character that need to be driven by a given amount when the driving rotations is positive, and by a different amount when it is negative. I thought the curve would handle that just fine.