Formular not working

Hello,
I’m trying to use your plugin calculating prices of rings, using the parameters to define the gold price so I can change prices for every product by just changing the value of the parameter.

My issue is with variable products. So lets say I have the same ring in 3 different types of gold 333, 585, 750. I need the formula to apply the different parameters (p1, p2,..) depending on the value of the Attribute “Gold”, so when I user changes from 333 to 585 a different p value will be used. I can’t get that to work. I’m not sure if I use the correct shortcode or even the correct way of writing the formula – the documentation is not clear on that.

Thank you very much in advance,
Philipp