Update, solved...

I used the FEvaluate_Bezier solution that Brian created and added some of my ugly VBA to copy the correct formulae and values for the chart.

Now you can state x values for time (ten values) and the plot creates a curve, then the FEvaluate_Bezier reads back values for a regular step interval, then it plots these new values so you can see how straight line and rounding of values effects the simulation.