Thanks for your reply evilSOB

But the point of the question is that just poking time_step in DOESN'T work, because subtracting a percentage of a number once a second (for example) produces a faster decrease than subtracting a quarter of that percentage four times a second, right? So normal time_step doesn't work.

I think the answer would have something to do with multiplying a power by time_step, but i don't know how it would work. I'll keep thinking but any suggestions are appreciated.