This is because some of the notes a voice can produce may not be considered usable by the singer within performance for various reasons.

This was divided into four different modes that cover all the sounds the human voice can produce.

The voice, though not human, produced speech that was clearly understandable.

Those familiar with the Williams repertoire will recognize the notes that his voice produced.

The voice of this bird is extremely varied and produces many different sounds.

I husked, my voice producing itself without benefit of mind to direct it.

His clear, fresh voice produced a favorable impression upon the boys.

The technique covers all the sounds the human voice can produce.

The vocal modes are the four ways the human voice can produce sound.

The justification for this secret diplomacy was that a loud voice would not have produced better results.