Enhanced Audio Resources: Player Demo HD
http://steamcommunity.com/sharedfiles/filedetails/?id=975683182 Enhanced Audio Resources is a sound pack for the source engine that aims to completely overhaul the hl2_sound_misc_dir.vpk file that most games and mods that run the source engine run. The results? A new source engine experience. The complete pack replaces over 1,400 base files to give your game a fresh new coat of paint. You can find a link to that at the top of the description. The aim of this mod is to represent realism without changing the initial intent of the vanilla sounds.