I recorded a 0-100 acceleration yesterday, and on the video i noticed a buzzing/rattling noise when releasing the clutch. So after that i did some test drives, and it seems that when i want to launch the car, and i have the clutched pressed and rpm is about 2500 / 3000 , and i release the clutch it gives me this noise. You can hear it in this video :

https://www.youtube.com/watch?v=61_wccQdZ6c

I have read many topics about the clutch buzz problem, but this seems like something else. Can the clutch been broken in some kind of way? I dont notice anything when driving, and also no other buzzing or rattling sounds except for the one when launching the car. I never launch my car at traffic lights actually so i never noticed this sound (and i have the car for many years now). Anyone got a idea what this might be?