通过改变频率来改变音乐的音调，升调或降调都能。另外还有移相（phasser.c)及反相(reverse.c)两个源程序源码文件 可直接使用。 -By changing the frequency to change the music tone, rising tone or falling tone can. There is also shift phase (phasser.c,) and reverse (reverse.c) two source code files can be