Set in the immediate aftermath of the zombie apocalypse, Left 4 Dead's survival co-op mode lets up to four players blast a path through the swarming zombie hordes and terrifying mutant monsters. Guide your survivors across the rooftops of an abandoned metropolis, through rural ghost towns and pitch-black forests in your quest to escape a devastated Ground Zero crawling with infected enemies.
L4D Sounds that when you fire a weapon it plays a laser sound and it sounds like you have a laser gun. (Sorry I don't have a video yet of this mod... I need to buy Fraps. Hope to get the video soon.)
***MAKE SURE YOU MAKE BACK UP FILE FOR WEAPONS***
To install go to Computer C > Program files > steam (valve-mac > steam) > Steamapps > common (NOT YOUR NAME) > left 4 dead > left 4 dead (again) > sound - and simply drag the folder into the sound folder and let it over right then test it out :) enjoy
..::Credit to me for cutting down sound and google for the sound::..