I actually went to check what white noise actually was and to be honest, Nick has better chances of understanding that, all I could gather was that it is a special type of sound that triggers random effects on people, Cynthia herself could be that indeed since she triggers several random effects on Jack and speaking of which, she looks more worried than angry in this drawing, being that close to Jack but unable to reach him no matter how hard she tries could totally drive her insane, I guess the ending of Black Jack will trigger this new comic, we can only wait to verify.