12세기에 이르러서 가믈란은 10개의 동판과 겐더와 같은 악기들이 사용되었으며, 7음계인 펠로그 조율이 성립되었다.
By the 12th century, 10 copper plates and instruments such as Gender were used for gamelan, and the seventh scale of Pellog tuning was established.