The struck idiochord tube-zither

•This instrument is made in a similar fashion to the polychordal tube-zither, but it has only one or two strings, supported by a common bridge, and is not intended to be tuned. The noise is typically an indeterminate buzzing sound. The strings are either plucked with the fingers or beaten with two light sticks, rather like a slit-gong. In the Philippines at least, these instruments are used to scare birds away from the corn. They occur through most of Indonesia including Sumatra, Nias and Sulawesi, but are only recorded in Melanesia from Biak in a monochord form and then disappear altogether