Last year at SPAH I attended a forum on the future of the harmonica and some top players said they wanted a chromatic that would overblow. I had a feeling that my chromatic would be able to do this. I took a valve off of the 6 hole and was able to do it. The reeds are not embossed. https://www.youtube.com/watch?v=ymc1tZS5Wo0 David Pearce