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AIC3254使用mono mixer后为什么音量会变小?



两个mic输入,用mono mixer把两路输入合成一路,再用split分开两路输出。

这样输出的声音较之前使用一路mic输入不使用mono mixer时音量要低很多,这是为什么呢?应该怎么用才能不让声音变小?