Hey, I'm working on something similar.
What would be the solution? :)
Basically, trying to set up a repeating flag (global variable) trip every X pixels to trigger a set of events once.
Problem is I'm not a math whiz.
It would work off scrollx.
So basically every X pixels scrollx rolls right for example, the same flag goes off.
Think it could be done with Trigger Once, then resetting the global variable flag trip to off at the end.
Just having trouble conceptualizing the math/formula.