pt2313 特点： ?1、支持3个音源通道输入切换(可以做音频混合)，四组音频输出通道(前、后、左、右) ?2、支持调节高、低音音效、音量、前后左右增益与均衡控制(1, support 3 channel audio input switching (can do audio mixing, four audio output channels) (before and after, left and right) 2, support regulating high, bass sou