@lochlistvan here you go I made it for work for you
parallax-mattress.hype.zip (591.8 KB)
@lochlistvan it works for forward timeline but not for reverse. The rule is defined in the script to work reverse but it doesnt work let me look into this. Heres a version that does allow you to scroll up and down forward and reverse.
parallax-mattress-PB.zip (592.7 KB)