She spoke to him directly, trying to keep her tone even.

Richard's anger flared again, but he kept his tone in check.

He kept his tone polite and calm, inviting the man on the other end to keep talking.

I asked, trying to keep my tone soft and without too much curiosity.

"It's already turning out to be more than one time," she finally said, working to keep her tone gentle.

He had the voice of a gentleman, but kept his tone rather low.

It took more effort than he expected to keep his tone casual.

The seaholder quickly gestured the man to keep his tone down.

He tried to keep his tone as measured as her own.

It was all I could do to keep my tone even.