to reduce the volume of the instrument itself, you can use a mute.
The mute of suona can refer to a small copper tube, which actually blocks a cone-shaped object on the outer mouth, but it is not blocked.
Jinghu's mute can be divided into two types: one is to put a big crocodile clip on the code (for electronics and electricians), and the other is to put a handkerchief into the piano barrel without blocking it.