Actually it makes all sorts of noises if you look in that video I posted above I clicked it five or six times and got a new sound each time including footsteps and the sound of gathering XP.
I have no clue what this could be hinting at though since we already have more sound options.
Edit: looks like this has already been replied to.
I'm still curious as to what all this super secretiveness could lead to though.
For me im getting all this demonic growling, Possibly a new boss? (Im running 36b)
EDIT: It seems to be sounds slowed down, these have some really spooky noises though #TinFoilHat
Well so far I really like what I see, too bad Mesa biome is bugged for so many people. Also super secret settings? hmmm I'm curious, I hope it's not some lame useless thing, and I hope they finish it that soon so we can finally know what it is. And I hope we can craft packed ice with 4 or 9 normal ice blocks, 'cause having them only in a very rare biome would be awful on servers.
To bad it isn't possible to decode the game to see what those settings are though lol ('cause there's no mcp and all that), but who knows, maybe even if it was possible, they didn't add anything of it to the snapshots yet just in case (except for the button).