Most of the sound of a melodica typically comes up through the keyboard, and apparent vent holes or slots are mostly cosmetic. But a significant amount of the sound of the Hohner Melodicas in this series comes out of the bottom, in this case through the rectangular holes. The tone can be further altered by blocking (with tape, for example) some of these holes. The sound can be further manipulated by covering and uncovering holes while playing. Blues player Lowboy Bootay is the first melodica player to fully appreciate this feature of this series of Hohner Piano Melodicas (26, 27 and 32) and to develop original techniques to exploit it.