The video captures the sound quite well. I would like to know if the sound increases with RPM, but can't quite tell due to loud exhaust. It's not AC clutch, it's not alternator, it's not the idler pulley... I almost can't locate it. It sounds like it comes from the top of the passenger-side timing cover, but it also sounds like it's coming from the bottom of the timing cover, and it also sounds like it's coming from the transmission. I'm completely stumped. It's the whirring/scraping combo'd with the groaning.
https://www.youtube.com/watch?v=DS098OZc1ug
https://www.youtube.com/watch?v=DS098OZc1ug