Three-tone hulusi in the need to play double or triple tone, the sub-pipe switch can be turned on, fingering blowing techniques and single-tone hulusi no difference.
Gourd silk plays tunes with a little more monophony.
From the performance: double tone is a sub-pipe, in the play of some cheerful and soft tune, to use the sub-pipe double tone, such as the depths of the bamboo forest, at this time it is to look at the hulusi sub-pipe double tone tone of the sound.
The tritone is pronounced by the two sidepipes, but it is less frequently used in terms of playing. Playing up is also more eat air, usually around the middle of high-level tunes to play, like pastoral songs and so on can be played with three tone.