Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_233830_1 (channels VARCHAR, soundfield_type VARCHAR, height_order VARCHAR)
### Question:
If the height order is 1 and the soundfield type is mixed-order, what are all the channels?
### Answer:
SELECT channels FROM table_233830_1 WHERE soundfield_type = "mixed-order" AND height_order = 1