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The sruti upanga ("drone bagpipe", or bhazana-śruti, druthi, or nosbug) is a type of bagpipe played in Tamil Nadu, southern India. The instrument was often used to supply a drone to accompany mukha vina (Tamil oboe) music.
The instrument was described in detail by one Charles Russel Day (1860-1900 CE)
Playing method
Beatrice Edgerly notes in 1942, similar to Day, that the pitch of the instrument was controlled by inserting wire or bits of silk.
References
Sruti upanga Wikipedia(Text) CC BY-SA