HD Sounds is a set of sounds used to make Garry’s Mod/Half-Life 2 more immersive. It modifies most of the walking sounds and water sounds. Replaces the two citadel explosions and the spray sound and replaces a shitload of more sounds with better versions, etc: Better crow sounds, better ambience… and so on.
If this is the wrong forum… tell me. I didn’t find any forum that would suit this…