Come to think of it– there was a piece of cloth that must have fallen from inside Gilligan when I was moving him to another location. I picked it up and threw it away thinking not too much about it. That was before I experience buzzing sounds that made me realize that felt I threw away has something to do with the harp. So I fished it out from the waste basket and put it on the music stand. Later, after I come home from harp lessons, I’ll see where the felt came from and try to fix it with glue or something.