Her voice didn't sound calm enough to match the words.

His voice sounded calm and he was holding the volume down.

He'd never have sounded so calm if his world was breaking apart.

She was glad to hear her voice sounding so calm.

He sounded very calm, but I could almost feel the hammering of his heart.

Now that he'd had time to settle down and maybe work out a story, Smith sounded not just calm but almost happy.

With age had come the ability to sound calm when the world was very possibly coming apart.

She tried to sound calm but knew that he would see through it.

She sounded so calm, I almost thought it was a joke.

How can you talk about this stuff and sound so calm?