Overblowing
Overblowing is the manipulation of supplied air through a wind instrument that causes the sounded pitch to jump to a higher one without a fingering change or the operation of a slide.In some instruments, overblowing involves the direct manipulation of the vibrating reed(s), and/or the pushing of a register key while otherwise leaving fingering unaltered.With the exception of harmonica overblowing, the pitch jump is from one vibratory mode of the reed or air column, e.g., its fundamental, to an overtone.Another type of overblowing is that used on instruments such as the transverse flute, where the direction of the airstream is altered in order to sound higher notes.Among Highland pipers, the term more often refers to a problem affecting the steadiness and reliability of the pitch and tone caused by an excess of air pressure.Notable practitioners of overblowing are Howard Levy, a founding member of the Flecktones, Paulo Prot, Adam Gussow, Otavio Castro, Chris Michalek, Jason Ricci, and Carlos del Junco.