In Linxi Township, Sanjiang Dong Autonomous County, Guangxi Zhuang Autonomous Region, there is a kind of polyphonic mango tube called Duotong. It is to open up all the bamboo joints of the moso bamboo resonance tube, and the ends of the head and the tail are opened into a 45° oblique opening.

With the assistance of the musical instrument factory, a twenty-nine-tube mango was developed, with a range of D-g2, including twelve semitones, maintaining the traditional mango tone. Can play single melody and polyphonic music.