Hi - I also have a winter white. Bracken has always chatted away to me when she comes out. I've heard that it can be a sign of nervousness or excitement. With Bracken, it's definitely a sign of excitement/contentedness, she will also buzz too, Souffle. She's a happy fluff though and always lets me know when she wants to come out and enjoys her time on the sofa with me or the playpen, I can't hear her chattering in there but she certainly has fun.