I want to tween opacity from 0 to 1 in 20 seconds, stop it at for example 11.5 seconds and then reverse it in 2 seconds. What would be the best way to do that? I tried to tween to opacity 1, pause() and tween to opacity 0 in 2 seconds, but opacity goes below 0. Would it be better to use reverse? And when I use reverse, how can I set a fixed duration, since timeScale() doesn't work because of pause().