I was playing Mario Odyssey and I had the joycons right next to my face. I was scrolling through the moon list when I noticed something. As I went down the list, the HD rumble emitted a tiny, high pitched noise. This in itself is no surprise. After all, sound is just vibration. The cool part was that the pitch got lower and lower as I went down the list. It got higher as I went up. I suppose there must be tiny rumble changes in each spot down of the list, but the fact that Nintendo would even include that is really cool to me.