For the first time, an edge of anger crept into the man's voice.

A note of deep emotion had crept into his voice.

I could hear the confidence creeping back into his voice.

A note of anger began to creep into his voice.

Then a hint of something else crept into her voice.

She couldn't help the laughter that crept into her voice.

The old man was sitting up now, anger creeping into his voice.

She allowed a note of hope to creep into her voice.

An urgency which she could not control crept into her voice.

She let a note of authority creep back into her voice.