Modulate the voice.
Nothing is more distressing than to hear the speaker's voice in a low, weak murmur or in an ear-breaking volume.
Have a clear and pure tone.
A good voice must be free from any disturbing and unpleasant elements of tone.
Have a pleasing and effective pitch.
Every speaker must acquire a pitch level of his own which must not be too high or too low. The moderate pitch level can help the speaker acquire a dramatic or emphatic effect.
Have a clear and distinctive diction.
A good voice is intelligible if a speaker has a clear and distinct diction. He must not omit or swallow sounds and syllables, as this world kill his speech.
Be flexible
The quality of the voice must vary as to achieve expressiveness.
Be at ease and relax - "alive" is the word.
Learn to breathe properly.
Defective breathing affects the voice unfavorably. Since there can be no voice without breath it is vital that those who want good voices breathe deeply and rhythmically.
