Scatter Visual with static reference lines

Hi Everyone, I ran into a problem with a scatter visual. I want to make a standard scatterplot which is not so hard. But the problem is that I also want two lines as a kind of bandwith. So the "bubbles" need to be between the lines (static), when a bubble is outside a line (above or below) then I want to get them a another color. The first thing are the "bandwith" lines, it seem that there is none custom visual to do this, am I right?. Do you perhaps know a solution, workaround eg, something that can help me?

Thanks for thinking and replys.

Kind regards, Martin