Also, I recommend to add a post process volume and turn the saturation down to 0 in order to view the values of the FX. This is not exactly the same as greyscale histogram but is straight forward and handy.
hey thanks for the blueprint setup! I bought an animation pack a while ago and wanted to do some fx for it also. How did you hook up the animation to play in the key press?
Have you tried lerping between Global Time Dilations using a timeline? I do it all the time, a 0.2 seconds float output, and then I turn the interpolation curves into bezier. It gives a really nice speed ramp feel!