Though it seemed the ensemble of shakuhachi and other instruments was officially prohibited by law, a picture in those days shows us that in fact the shakuhachi was already participating in sankyoku gasso at the end of the 18th century.
しかし他の楽器との演奏は法令により表向き禁止されていたらしいが、実際にはすでに18世紀末に尺八が加わった三曲合奏図が見られる。