She answered "What's frightening is that his argument can sound sane.

This last one probably is greed, Russian accent, but at least the guy sounded sane.

She wanted to hear her own voice to see if it still sounded sane, for one.

"Ask him to have Sulu say something; see if he sounds sane to you."

Yes, she sounds sane, doesn't she, among all these other people I'm working around?

"I will unite the territories," he said, sounding altogether sane.

She sounded sane, and on her shoulders now rest the force's hopes of restoring its reputation.

You made it sound quite sane at the time.

"Allow me to speak to Miri," he said, and the measured voice sounded only sane.

You sound totally sane compared to most of them.