There is a traditional Chinese flute 3 button button may have a thin sheet to close hole to cause a sound of Chiefs. Players will have a lot of tricks blow which will cause a different voice.
A traditional Chinese flute with 3 buttons may be thin to close the hole to cause resonance. Players will have to blow a lot of techniques. This is sounding different.
A traditional Chinese flute 3 button button may be thin plate to close the hole for sounding aflutter. The player will have the technique to blow. Which could lead to a different sound.