How to recreate the line signal at the bottom of RD29A

RD29A has a helicorder graph, wave grap and spectral graph. Below all that, he has another display which resembles the needle on paper affect. How does he fo that? I have seen it on other stations but can’t get any feedback on how to setup that signal. Thanks.

Hi, I think I understand what you are asking, but I’m still a bit lost as to what graphs you’re talking about. Can you send a link or a screenshot?