I played a new model of an overblow harp at the Windy City Harp Convention in Chicago in late August. The harp I played was a normal 10 hole diatonic with a button on the side to dampen the blow reeds 1-6 and the draw reed 7-10 to make overblowing and drawing easier. In my opinion, it is not worth the money. It was designed by Jim Mclaughlin.