The original Playstation was a very special console. It opened console gaming to adult audiences and introduced some of the controller layouts and game IPs we still see today. But there was an underrated element that you see everytime you load a game: the bootup sound and animations. With the combination of those cool logos and sounds, even loading a Barbie game seemed like serious business.
5 years ago, a Youtube video explained how the bootup sound was made: it turns out they use 3 base sounds and mix it together several times (including some of them 2 or 3 times with changing speeds) to create this hypnotic theme.
It's all in this video: Nitrocosm - Playstation Sound Explained (https://youtu.be/lkSd30d7JzM?si=o2tY81NrI_AJ1Rac)