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