Zhurèn

I found that I had exact same problem as yours since I began to play piano sounds in daw, same key, same buzzing. didn't noticed that before. so it's impossible for me to get help from official support. for this reason, I decided to solve this problem with my own hands. AND I FOUND IT EXTREMELY EASY TO DEAL WITH! 1. remove the speaker shield carefully (pretty easy) 2. remove 4 screws around the speaker 3. open it, you will find it has very simple structure inside (which means the problem won't be so complicated ) 4. see the black pad underneath the speaker？does it looks very thin? yes! that may let the resonation effect the plastic box and make it buzz！ you should find something like the origin pad but thicker, put it there, and put the screws back 5. or you can check the wares inside the box before you put everything back, though they had been nicely covered by material, but you can still check them, just in case all moves above takes 10mins, and your problem should be gone, no damages have to be done