Modulation makes meaning. A change in frequency in speaking tone provides the listener with a signal that something is happening. Voice modulation means the fine-tuning of the pitch or tone of voice that helps the audience clearly hear and understand the lecture, presentation, and speech delivered by a speaker. Modulating your voice means moving the pitch up and down. A downwards pitch adds authority to a sentence i.e. unquestioning acceptance. An upwards pitch adds interest to a sentence. It questions and provokes engagement and response.  If the voice is not modulated and the pitch kept same in the entire state then it will sound odd at its best and at worst dull, boring or confusing.

For e.g.:-

I was just wondering…whether you would like…maybe to come today?

Some tips you can follow:-

• Listen to the TV presenter introducing a program or reading the news. Notice how their voice goes up and down very deliberately. They know very well what they are doing.
• Notice also how the TV presenter moves their head and there in time with the modulation. Their body is often positioned by a table or even off-camera. They have to use just their voice and their head to convey meaning.
• The most important three speech organs of a human being are lips, jaws, and tongue. You have to exercise these three speech organs like other parts of your body. Reading loudly can help you discover the variety, power, ability as well as faults of your vocal organs. Such a regular practice will certainly help you correct and improve your voice modulation.
• You can at times record your speech on a device, and listen to it later for any flaws. Besides, whenever you attend a meeting, event, lecture, or seminar, you should mark carefully how effective speakers vary the pitch of their voice to match the thoughts, ideas, and feelings they convey. Also, consult a dictionary not only for the meaning of a word but also for the pronunciation of the word.
• Always convey your message with the variation in the pitch and tempo. Never deliver your speech in a monotone as it will not only bore but also send your audience to sleep.
• Speak normally at about 125 to 150 words per minute. Check your speed and try to bring it within this range.
• Pronounce words properly, putting stresses at the right syllables.
• Speak loud enough so that everyone in the audience can hear you clearly.
• Pause for a moment in between sentences to control your speed and approach better.
• Avoid vocalized pauses and nasalization such as ‘er’, ‘ah’, ‘unh’, ‘umm’, etc.
• Take care that you do not repeatedly use such phrases as ‘you see’, ‘I mean’, ‘What I meant,’ ‘Understand?, ‘Have you understood,’ ‘Clear?’, ‘Is it clear?’, ‘Was it clear?’, etc.
• Avoid lazy lip movements always try to maintain a balance while speaking or delivering your lecture.