I guess this is as good a thread as any - does anyone know where the TR-909 cymbals came from? The kicks are obviously synthesized, but the open and closed hih

I guess this is as good a thread as any - does anyone know where the TR-909 cymbals came from? The kicks are obviously synthesized, but the open and closed hihats sound suspiciously much like audio waves that are simply played at a higher and lower frequency as you twist the "decay" knob. If they're samples, where do they come from? They're totally unlike any other hihat I've heard, definitely totally different from an actual hihat on a physical drum kit. I guess 90% of dance/techno music in the last 3 decades uses the TR-909 open hihat or a mildly tweaked version of it. Yet it must've been a rather strange, unnatural sound when the 909 was released. What were the motivations of the people who designed or recorded this sound? How was it made? Was it sampled or synthesized and then recorded? Was Kakehashi involved?