《晋书·志·第六章》
让太乐郎刘秀、邓昊、王艳、魏邵等与笛工一道研究制作，工人负责笛的形制，律家调定它们的音律，于是乐器形制有了规范，音均和谐了。
辄部郎刘秀、邓昊、王艳、魏邵等与笛工参共作笛，工人造其形，律者定其声，然后器象有制，音均和协。
I asked the Imperial Musicians Liu Xiu, Deng Hao, Wang Yan, Wei Shao, and others to research and make it together with the flute makers, with the craftsmen responsible for the shape of the flute and the musicians for adjusting their pitch. As a result, the shape of the instrument became standardized and their pitch was harmonious.