What’s the best way to plot a randomly generated envelope curve?

I have a function setup to randomly generate: 1) number of points on the envelope 2) x-values (time values) and 3) y values (between 0-1)

So far, the most likely object seems to be jit.mgraphics. However, it requires that information be sent to it point by point.

Is there a function that would allow me to send it N number of x/y pairs, and plot the resulting shape?

Thanks,