Thanks for giving it a shot! Sorry if it was a bit confusing.
There's a separate map included with the game that displays all the possible codes, the sounds change depending which warehouse you are trapped in. So if you hear a farm in front of you, then you can check the map for all the warehouses that are near farms. If there is also a river on your right, then that should help you narrow down the possible locations even further and figure out the correct code.
p.s. you can press "F" to focus in on the sounds which helps you hear the sound that you are looking at more loudly.
p.p.s. Thanks for playing and rating!