说明：  最便宜的音量集成电路62429的控制程序。程序中只是假设用于控制麦克风的音量和回响效果，如果要作为其它用途，只要更改全局变量名即可。
(IC 62429 cheapest control program volume. Assuming the program is only used to control the microphone volume and echo effects, as for other purposes if you want, as long as the changes to the global variable name.)