He sang a song in a loud voice.

He called my name in a loud voice.

He voiced his feelings out loud.

He raised his voice in surprise.

He said nothing, just made a sound.

I could hear a groan of pain coming from his room.

The structure of the vocal tract is very important in forming human voices.

He said it under his breath, suppressing his anger.

I heard a dog's bark from nearby.

I could hear the dog's howling all night long.