add chest open/close sound

chest.lua

@@ -148,6 +148,9 @@ core.register_node("protector:chest", {
 			.. "listring[current_player;main]"
 		end
 
+		core.sound_play("default_chest_open", {
+			gain = 0.3, pos = pos, max_hear_distance = 10}, true)
+
 		core.show_formspec(clicker:get_player_name(),
 				"protector:chest_" .. core.pos_to_string(pos), formspec)
 	end,
@@ -222,6 +225,10 @@ core.register_on_player_receive_fields(function(player, formname, fields)
 			meta:set_string("infotext", S("Protected Chest"))
 		end
 
+	elseif fields.quit then
+
+		core.sound_play("default_chest_close", {
+			gain = 0.3, pos = pos, max_hear_distance = 10}, true)
 	end
 end)