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These instruments form an important family of the gamelan, the other being that of the suspended keys. They are today more common in Java than in Bali.
Laying keys tend to vibrate less well than suspended keys but give a more robust sound.
Typically, the keys cover completely the open surface of a trough-like resonance cavity. They thus all share a unique resonance cavity. One exception can be found in the north of Bali in the gong patok. The gangsa instruments of this ensemble have individual bamboo resonators like the gendér but laying and round-surfaced keys like the saron.
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