CREATE TABLE table_233830_1 (channels VARCHAR, soundfield_type VARCHAR, height_order VARCHAR)

If the height order is 1 and the soundfield type is mixed-order, what are all the channels?
SELECT channels FROM table_233830_1 WHERE soundfield_type = "mixed-order" AND height_order = 1
SELECT "channels" FROM "table_233830_1" WHERE "height_order" = 1 AND "mixed-order" = "soundfield_type"