Most mutes can still make audible noises, perhaps not the "normal" laughter you and I are used to on a daily basis, but I did at one time date a wonderful young lady that was mute, she was at the same college I was...smart as can be and a class act. I did have the chance to tickle her, and she did make some cute noises, had the same facial reactions...which was her laughter. Not one with the tone of her voice, but the noises were still sweet.
She was indeed a great person. She married a while ago, and has a really great life. She deserved it.
Rob