Speakers control the production of sound either using their own voice or a microphone so that amplified sound is loud enough to be heard.
Rate is the speed of speaking in words per minute from slow to fast, with normal rate averaging about 125 words per minute.
Changing the pitch while speaking can convey shades of meaning such as emphasis or surprise, or distinguish a statement from a question.
A speaker may use pauses to enhance the message delivery; a speaker may also user filler words and pauses that distract from the message.
Articulation focuses on making individual sounds and pronunciation focuses on stress, rhythm, and intonation of the syllables in the word.
Speakers may use many different English dialects to change the pitch, rate, volume, and use of pauses to achieve vocal variety.