human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Horizontal order, Height order, Soundfield type, Number of channels, Channels
###Question: If the height order is 1 and the soundfield type is mixed-order, what are all the channels?
gpt
SELECT Channels FROM table WHERE Soundfield type = mixed-order AND Height order = 1