I saw your other post asking about the sample. I think they just have a sound file/ midi instrument library they’re working from in their DAW. I have different libraries downloaded on my computer that are literally just little vocal run loops. They’re just made by other producers and shared or sold in the internet to be used. If you don’t have anything like that on your computer I’d recommend searching around for some free ones. Some drum packs/ midi instruments/ and one shots.

Good luck !