Adds a metric assload of sounds.

code/modules/projectiles/guns/projectile.dm

@@ -83,6 +83,7 @@
 	switch(handle_casings)
 		if(EJECT_CASINGS) //eject casing onto ground.
 			chambered.loc = get_turf(src)
+			playsound(src.loc, "casing", 50, 1)
 		if(CYCLE_CASINGS) //cycle the casing back to the end.
 			if(ammo_magazine)
 				ammo_magazine.stored_ammo += chambered

code/modules/reagents/reagent_containers/food/drinks.dm

@@ -24,7 +24,7 @@
 		open(user)
 
 /obj/item/weapon/reagent_containers/food/drinks/proc/open(mob/user)
-	playsound(loc,'sound/effects/canopen.ogg', rand(10,50), 1)
+	playsound(loc,"canopen", rand(10,50), 1)
 	user << "<span class='notice'>You open [src] with an audible pop!</span>"
 	flags |= OPENCONTAINER