Board Thread:Questions and Answers/@comment-5131007-20130908192632/@comment-10751008-20130910012521

Going back to my Plant Island just recently to mute my monsters, I realize that I can't hear the sound anymore. The only logical guess I can come up with is that they removed the sound altogether, perhaps in a previous update. I only actually heard the sound when I was still pretty new to the game, developing my Plant Island. I never really did pay attention to the Breeding Structure sound on other islands, so I just assumed they made sound.

Belthazar's comment, however, gives me reason for doubt because it may be based on your device rather than the server. I can easily hear the castle on all my islands (except Gold).