MT_VOLUME_CONTROL_CHANNEL_INDEX
write_mt_uint8(ice, MT_VOLUME_CONTROL_CHANNEL_INDEX, i);
write_mt_uint16(ice, MT_VOLUME_CONTROL_CHANNEL_INDEX, mute);
write_mt_uint8(card, MT_VOLUME_CONTROL_CHANNEL_INDEX, i);
write_mt_uint8(card, MT_VOLUME_CONTROL_CHANNEL_INDEX,