If it has its original string on it, there's a good chance that the loops are served with monofilament. That is very noisy when it slaps the limbs at the end of the shot. Nylon serving would be a little more quiet. A flemish twist string even quieter. Some folks wrap that area -- 5-6 inches from each string loop toward the center -- with wool yarn to quiet the string slap,and/or put some moleskin strips in the string grooves on the limbs. Regardless, the string slapping the limbs at the end of the shot is one of the differences between recurves and longbows. For that reason, it's very difficult to get recurves as quiet as longbows.