Transitioning between speeds using lerp

Hello, I’m trying to transition between two speed variables depending on if you’re running or not (pressing LShift), I’ve followed a third person tutorial by Unreal Engine for version 4.8 and wanted to change so that it walks instead per standard and then you can press Shift to run. There’s a 1D Blend Space where the Run Animation is at 600 and the Walk animation is at 200.

Now I want to transition nicely between these two using Lerp, unless any of you have a better way of doing this.

So everytime you change the state there’s a TransitionSpeed that I feed into the Alpha of the Lerp, now I just need to know how to gradually run down the value in TransitionSpeed from 1 to 0…

Thanks in advance.

For anyone finding this thread I found a way to do this by looking at: - YouTube