"Jegogan: The lowest pitched of the gangsa is the jegogan; this instrument also requires long resonating bamboo tubes so is played while sitting on a chair ...
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or bench. It has five keys (1, 2, 3, 5, and 6); jegogan with seven keys are also commonly found in Bali. It plays at submultiples of the pokok and is played particularly at important structural points where the gongs also play." - http://remus.shidler.hawaii.edu/GAMELAN/BALIINST.HTM, 15.12.2018
