Well, it’s sort of the track direction function, but with
a) more patterns available
b) the ability to have tracks jump from forward direction to another pattern with a single button push, and have them return to forward with the button release
c) the ability to easily automate periodic activation of function b. I guess you might be able to do it with the effector or step events now, but it’s complicated, especially if the tracks you want to effect are across multiple pages.