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Can't store float value over time.

Hello! I am absolute novice to Blueprints and Unreal in general. I tried to play “CameraFocusSound” whenever there is a noticeable change in vector float. To do that I need to store a “Last FrameVectorValueVariable” over a certain period of time to then compare it to a new vector value. With this poor setup I can’t store the float value.

This is the demo for Zoom in-out sound,but there is no sound for adjusting focus:

https://www.youtube.com/watch?v=-MTh…ature=youtu.be

What am I doing wrong? Thank you!