AMIXER_MIC
amix_d = mixer->amixers[AMIXER_MIC*CHN_NUM];
amix_d = mixer->amixers[AMIXER_MIC*CHN_NUM+1];
case MIX_MIC_IN: return AMIXER_MIC;
case MIXER_MIC_P: return AMIXER_MIC;
case AMIXER_MIC: return AMIXER_MIC_C;