AMIXER_MASTER_F_C
amix_d = mixer->amixers[AMIXER_MASTER_F_C*CHN_NUM];
amix_d = mixer->amixers[AMIXER_MASTER_F_C*CHN_NUM+1];
case MIX_PCMO_FRONT: return AMIXER_MASTER_F_C;
case MIXER_MASTER_C: return AMIXER_MASTER_F_C;
case AMIXER_MASTER_F: return AMIXER_MASTER_F_C;