The pitch of the C-foot flute is determined by many factors such as the diameter of the flute, its length, the size of the sound hole, and the distance between the sound holes, which are closely related to the tone and pitch of the C-foot flute.

1. If the pitch of the C-foot flute is low, you can use a knife to dig out the upper part of the sound hole, and the pitch of the sound hole will rise correspondingly when the sound hole is larger, or you can slightly dig the blowing hole toward the sound hole.
2. If the pitch of the C-foot flute is high, you can use wax to stick a point on the top of the sound hole or stick a point with tape. If the individual soulmates are dull and the tone is not good, you can dig out the bottom of the sound hole.
3. If the sound of the C-foot flute is sluggish, check whether the "flute plug" is blocked tightly. If the air leaks, it will affect the sound pronunciation, so the flute plug must be blocked tightly. The position of the flute plug should be appropriate. Generally, it should be fixed at 1.5mm~2mm from the edge of the blow hole. If the flute plug's position is not proper, it will affect the tone and pitch of the C-foot flute, so it needs to be adjusted in time. The flute plug is usually made of harder cork, and it can be inserted into the appropriate position in the tube.
4. In addition, the method of playing will also affect the pitch of the C-foot flute. If you play too hard, the pitch will be higher. On the other hand, if you don’t use too much force, the pitch will be lower. Therefore, you must pay attention to the uniform use of air when playing.
If there is a problem with the tone and pitch of the C-foot flute, in addition to the flaws in the production of the flute, the flute needs to be repaired and adjusted, and more importantly, it is necessary to train strictly in peacetime, increase the concept of pitch, and effectively solve the problem of the sound and tone in the playing technique. The influence of intonation.