Bits and pieces!
I will post some information of various Kung FU instructors and schools when he traveled China in search of our roots, I will try to present the ones that agree with what Jimmy taught.
*Make sounds with movements.
The emission of guttural sounds along with the expiration and the attack is a particular feature of the South styles
Each style has its own peculiarities in this sense, but in general are used to certain sounds movements claws, punches, elbows, kicks, etc.. This noise, although it seems to be born of the throat, actually originates in the Dan Tian and is a way to increase the explosive force of the attacks by giving energy to the movement. It is said: “the cry is like the wind: pushes the clouds and changes its color.” (呼喝 侧 风云 变色).