Cassie doesn't whir. She has a funny little sound she makes without even opening her mouth, like "Mmm!" or "Mmm?" It means everything from "Just wanted to let you know I'm here so you'll watch where you step" to "Could you open that window for me?" She's got another sound, "murp" that's more of a demand: Murp! I want a treat! Murp! Share the milk from your cereal bowl with me! Murp! If that's tuna salad you're making, I'd like some tuna NOW.