Calculate rate of change of a value (slider)

I suspect this is easy to do but I’m blanking at the moment. Any help welcomed.

Using the Smoothness FX I can create a slider with a recent value. If I could subtract this slider’s value from the current (and lose the sign) I’d have what I need…

PS I can’t find current numfx documentation on the website.

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There’s some info about Number FX in the docs: Data Sending and Receiving | VIDVOX Docs

And a tutorial here: Creating a 'Falling' audio level data-source using number FX chains in VDMX — VDMX - MAC VJ SOFTWARE

I did the math in a Vuo plugin and that seems to work OK. I’m still curious if there’s a way to do it in VDMX native.