Zi Collection, Upper Volume Radical: Stone (shí) Page 94, Entry 01 The Expanded Rhymes (Guangyun) indicates pronunciation as lao. The Collected Rhymes (Jiyun) indicates pronunciation as lao. Both share the same pronunciation as lao. The Jade Chapters (Yupian) defines the term as laocao, referring to a sound. The Collected Rhymes (Jiyun) defines it as a loud sound. In the Rhapsody on Whistling (Xiaofu) by Cheng Gong-sui, it is written: Numerous sounds combine in complex harmony, resembling the barbarian flute and the vertical bamboo flute. The crashing and booming sounds vibrate faintly, while the roaring and clashing noises are loud and clamorous.