The overall tone of the flute is crisp and bright, but there are differences in specific and subtle. Mr. Yang Yinliu talked about the flute in the article "Musical Instruments Accompanied by Kunqu Opera" in the "Xi Bao" in 1937, which is now borrowed and copied as the beginning of the discussion on this topic: "There are eight ways to play: , sand, dang, crisp, loud, spacious. All the songs of Jing and Laosheng must be played loudly; Zhengdan and Guansheng must be played crisply and brightly; Wudan and Liudan are sharp and thin, and the songs sung by the ugly pair , must blow intermittently."

Mr. Yang Yinliu summed up the sound of the flute that should accompany each character in Kunqu Opera, very precise. However, whether these various timbres can be played by a flute, or whether a flute can play only one timbre, is not explained in the text.

In my opinion, there are many factors that affect the sound of the flute, such as the age, thickness and thickness of the bamboo, the shape of the blow hole, the position, size and shape of the membrane hole, etc. Bamboo is old and thick, and the diameter of the pipe is large, and the sound must be thick; the diameter of the pipe is small, the sound must be sharp; Another example is the membrane hole, which is slightly larger and larger, and smaller and thinner. These are all known to performers and production technicians, and needless to say. This article intends to talk about the impact of playing methods on timbre.

As mentioned above, when I verified the "spray angle" theory put forward by Mr. Yu Xunfa, I used artificial blow holes for playing experiments. This mouthpiece can play various notes on the author's homemade flute. The author unexpectedly found that the timbre played on several flutes with this artificial mouthpiece is relatively uniform: soft and monotonous. What is the reason? I sighed, this is because the flute sound at this time lacks oral resonance. Through this experiment, I consciously combined oral resonance with breath control, so that the timbre of Xiao and Flute can be changed more freely.