Low whistle grip" may be required due to the distance between the holes. They belong to the same woodwind instrument family of end-blown fipple flutes. Though the tone of this instrument varies subtly among makers, low whistles are generally characterised by a more breathy, flute-like sound than traditional tin whistles. While the precise history of the low whistle is often debated, it is known that various kinds of vertical fipple flutes have existed in antiquity. The fipple flutes developed during the 16th century were the ancestors of today's low whistle, carrying through from early transverse flutes the six-holed design tradition and conical
Tin whistle narrowing the lip/embouchure. Since the size and direction of the tin whistle's windway is fixed, like that of the recorder or fipple flute, it is necessary to increase the velocity of the air stream. (See overblowing). Fingering in the second register is generally the same as in the first/fundamental, though alternate fingerings are sometimes employed in the higher end of the registers to correct a flattening effect caused by higher aircolumn velocity. Also, the tonic note of the second register is usually played with the top hole of the whistle partially uncovered instead of covering all holes as with the