That's why I've taken up the Kazoo. One note penny whistles are just so limiting.

I don't know whether the blatt is the attack or the harmonics. I know the blatt is most intense during the attack, but I don't know whether it is a function of the attack or what ... I just know it is rare that speakers capture this effect.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.