To complement the Chord Harmonica, Suzuki offers the Double Bass Harmonica for ensemble play. Special voicing or tuning gives the Double Bass a beautiful, rich, projecting sound quality. The upper low notes are tuned to a CH scale and the lower low notes are tuned to a C scale. You can cover a full 2 chromatic octaves. Each note has 2 reeds which are an octave apart. Double reeds create not only a deep and rich sound, but also a crisp sound with a projecting edge. The player has ultimate control for just the right effect. Each instrument comes in a beautiful velvet lined wooden case with carrying pouch.