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 sound, volume, after about the gain and balance control)