MAtmos is a sound atmosphere generator for Minecraft. Whenever you play on any multiplayer server or in singleplayer, it looks at your surroundings and generates natural noises as a soundscape, such as birds chirpling in the forest, rumbling noises near a lava lake or wind gusts on a hilltop. This fills out the perpetual silence of Minecraft.
Information/Download
All information and download information has been moved here:
MAtmos website
— Download
This mod is no longer officially updated, but there are unofficial builds available linked at the top of the Downloads section.
Source code
Hurricaaane/MC-Commons on GitHub
Hurricaaane/MAtmos on GitHub
License
All mods are under WTFPLv2 unless noted otherwise. Redistribute/Modify at will.
No need to ask permission for use of my mod in mod packs, I won't reply, the answer is yes you are allowed to, and I don't care where you use it

1
Yes, but you'll need to send me a small deposit of $34.99 by paypal. Or read the OP.
1
Just sayin'
edit: You could actually say I'm being penalized for not stealing the game and bypassing the authentication servers.
1
Sand. Vagina. Hypocrite. Liar. Proselytizer.
Please refer to the sticky regarding this subject instead of shitting up worthwhile threads.
1
Yeah I'm on a Mac, .xxxx files are hidden by default in the Finder (OS X's 'explorer'). It was there, you just needed to open the folder through terminal in order to see the contents - which you need to have open in order to expand, add mods and then compress back into minecraft.jar anyway.
Folks on a Mac, here are the instructions for modifying the minecraft.jar folder in OS X. You will also need to add the files from "minecraft' to the base minecraft folder in your library folder. Here are the instructions for adding mods to minecraft.jar in any case:
1) Go to Applications>Utilities and open terminal.
2) Type in the following, line by line:
3) Outside of terminal, copy all the files and folders into the mctmp directory.
4) Back inside terminal, type in the following:
5) Run Minecraft, enjoy!