How to change effect strip input in Video Editor? Let's say I have a cross fade track from Track A to Track B.
Now I decide to create a gaussian blue effect strip over Track A, let's call it Track C
Now I want the cross fade from Track C to Track B, but i can't change the "Input 1" parameter from the cross fade track because it's grayed out.  

Do I really have to create the effect again? Or is there a better way to solve this problem?

I just started learning blender, so sorry if i'm using the wrong terms and this question is already answered.
To change input1 parameter:


Select strip you want to make an input
Shift+right click to select strip with input you want to change
Press Strip -> Reassign inputs (or just hit "r" as a shortcut)
Hope this helps.