The board and the eye represent the beat of the music, the board is the strong beat and the eye is the weak beat.

Specifically, the board is the board type. The board structure in opera singing music can be divided into two categories: board variations and Qupai series. In the structure of the board variations, there are mostly board types such as adagio, allegro, 28 board, flowing board, and loose board.

In all types of board styles, the strong shot is the board and the weak shot is the eye. The relationship between the strength and weakness of the board style is the board eye. Among them, the one with a beat of 2/4 is called Yibanyan, the one with a beat of 4/4 is called Yibansanyan, and the one with a beat of 3/4 is called Yibanliangyan. If the singer has a poor sense of rhythm and unclear strengths and weaknesses, he will either grab the board, skateboard, or fall off the board.

As for decorative sounds, what I learned is that reverse echo has not been used for a hundred or two hundred years. You can refer to it~