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The hulusi is ma de of o ne to f our bamboo pipes that have a small brass or silver reed inserted flush with the side of the pipe, and then surrounded by a gourd or brass (on modern instruments) wind chamber. Hulusi has a main pipe and two drone pipes, which can play chord. One drone pipe produces high pitch and once produces low pitch. But it is not uncommon for a Hulusi to have only one drone pipe sound while the other drone pipe is merely ornamental and has no sound