The new whistle is not ready to be used immediately after it is made. The sound of a good whistle is sweet but not dry. The relationship between the tone of the tube and the octave of the eye support is accurate. If the above requirements are not met, there may be the following problems：

(1) Fat mouth.The new whistle reed was dissatisfied with the post, and as soon as it was sticky and wet, the whistle opened wide again and couldn't be blown.The solution is to put the whistle on the bamboo pole, use a soldering iron to brand the front and back sides of the whistle, and brand the two corners of the whistle.The mouth of the whistle remains pointed at both ends, with the shape of a jujube nucleus in the middle.

(2) The whistle is thick, the pronunciation is slow, and it is not bright.You can use a knife to lightly scrape the whistle surface (or use sandpaper to lightly grind), and scrape less in the middle of the root of the whistle surface, so that there is a hard tendon in the middle, which straightens the whistle surface, which is conducive to vibration.The whistle is lightly ground with a grindstone or fine sandpaper to make the whistle thinner and react quickly when blown.

(3) The whistle is thin, the high pitch is not easy to blow out, and the upper handle is pronounced low.You can use scissors to cut off a small part of the whistle.

(4) Collapse of the cavity.Since the mouth of the whistle is not a jujube karyotype, it is concave in the middle, so that the high pitch cannot be blown out, and the sound of “eating” air appears when the weak sound is blown.You can use bamboo sticks to prop up the whistle surface and use a soldering iron to re-brand the type.If the cavity collapses severely, it will be difficult to repair.

(5) Tibetan qi.Since the two pieces of the whistle have shoulders, the whistle surface should be fan-shaped rather than square, and the square is said to have shoulders, which causes unresponsiveness.You can use your thumb's index finger to hold the whistle surface tightly, pinch it firmly, scrape two clips with your right thumb nail, press off the corners of the two clips, or use a soldering iron to iron off the corners, so that the square becomes a fan-shaped shape, in order to avoid hiding gas.