The SW010 (formally S-991) is a two necked (straight and curved) instrument with not only a high F# but also a high G conveniently located on its keyboard. It has a marvelously responsive touch and it's scale and pitch are as good as it gets. The 010 has incorporated features not found in either the Selmer or Yamaha, and has already made significant in-roads with the top echelon of Soprano players.