Calculating on the fly with Sliders

Hi - I'm trying  to  recreate a Xcelsius/Flash interaction in SL2.  There are 3 sliders and just need to total their associated variables. You can see the original version here.  In the the original the calculations are done  automatically. But in SL2, whenever the slider moves, it just keeps adding to the total. I can do this with a Calculate button, but I'm trying to avoid that.  Any ideas?

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