Maybe its a tradeoff for Andrea and Pierre, So Andrea has the higher more childish voice, so maybe while Pierre has a slightly lower sultry, voice. Thats the way it is with Caroline and Stephanie, everyone thought Stephanie would have a low deep voice, not true at all! Its very high , soft, slow speaking, childish sounds like a little girl, while caroline I've heard all of the Grimaldi members speak except for Caroline. Anyway they said that her voice is alot lower, huskier maturer more sultry adult voice. Cause people were expecting Caroline to have the higher voice because she has a much more femminine face and body not broad shoulders and narrow hips. While Stephanie has a boyish face and body. Thats why they thought Caroline would have a higher voice and Stephanie would have a lower voice. But not true at all.