Do I apply for a mod by posting here? It improves the feel of the game by providing sound equivalent of OptiFine. For instance, while in the woods you hear birds chirping, and in the evening, crickets, etc. The sounds for the Nether is simply freaky. The mAtmos mod can be found at: https://github.com/dags-/MAtmos/releases
The resource pack you need is http://ha3.eu/x/tempshare/misc/msi_conversion.zip
Also see: https://hypixel.net/threads/matmos-how-to-install-matmos-on-1-7-10.165793/
on how to install the mod.