Hulusi is a wind instrument, and all wind instruments are more or less affected by changes in temperature and humidity. In different regions and climatic conditions, the pitch will change slightly. In order to cope with this change, proper tuning of the pitch was required, resulting in the interface type tuning jack.
The tuning jack realizes the pitch change by extending or shortening the length of the air column inside the instrument through the expansion and contraction of the copper interface, so as to meet the needs of performance and teaching. The principle is to pull out the plug-in position of the interface, and the air column in the bamboo tube will increase, and the overall pitch will decrease a little bit; on the contrary, the overall pitch will increase, so that the instrument can be adjusted between 10 cents and a minor second to achieve The purpose of harmonizing with bands and CD music.

When using the tuning-type cucurbit flute, pay attention not to use too much force when unplugging and inserting the interface, nor to pull or push it straight. Use appropriate force to rotate left and right while pushing and pulling until the pitch is adjusted to a suitable height. Try to avoid using the instrument for outsiders or people who don't understand it at all, so as to avoid wrong operation, resulting in deformation, damage or air leakage of the interface. In terms of maintenance, it is necessary to supplement the copper interface with an appropriate amount of lubricating oil on a regular or irregular basis to prevent the interface from corroding and rusting.
It should be noted that tuning is only a small range of appropriate adjustments to the absolute pitch of the pitch, and cannot be used as a transposition. Because the tuning of the cucurbit flute has different pitch adjustments, in principle, the tone closer to the reed is more sensitive to the adjustment of the tuning interface, and the farther the tone is, the duller it is, and the tone 5 will not be tuned. Change control of the audio interface.