Ho to: Inverse slider?

Is there a way to set the slider to an inverse setup, ie. 120 to 0 , left to right? I have this particular slider set to a variable, but the gadget itself does not like having the higher number on the left side.

I did figure out how in PAC Control, but it would still be nice to just be able to do this in the groov gadget natively.

Where I am using the variable I inserted this bit of math:
inverseX=AbsoluteValue(X-Xmax)

Now 0 to 120 turns into 120 to 0

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