This is some information about MAtmos Mod 1.6.4/1.6.2/1.5.2 that you need to know before installing

Usage:

In-game, press F7 to open the menu. You can rebind this key in Minecraft keyboard settings. Hold down F7 to quickly change the global volume: Look up or down to set the volume. In this menu, you can change the volume of each sound set (called Expansions). For instance, if you don’t like having sword sounds, tune down the volume of the corresponding expansion, in this case, interactions_weapons.xml. If you set the volume to 0, it disables that Expansion until you change the volume again. If for some reason you need to disable MAtmos in-game, open the menu and click on Turn Off. You can also set MAtmos to start disabled in the menu. ...

View more and Download here : List of minecraft mods 1.7.2/1.6.4