Soft-spoken
Oxford Dictionary
Speaking or said with a gentle, quiet voice.
I’ve been accused of being soft-spoken more than once in my life. I can’t count the number of times someone asked me to speak louder because they couldn’t hear me. Early in my career, when I made presentations in front of a group, one of the first things I’d ask is, “Can you hear me?” Not a good way to start a presentation!
In addition to speaking loud enough for everyone to hear, there are things you can do to enhance your presentation and ensure your audience stays engaged.
Toastmasters International teaches you the importance of vocal vocabulary. Fluctuations in the volume or pitch of your voice helps to keep the audience engaged. It makes listening to what you have to say more interesting than listening to someone delivering a presentation in a monotone way. Changing the pace of your voice and pausing at the appropriate time adds impact and interest.
One of the best examples of vocal variety I can think of is storytelling. Think about it.

A story told with emotion and expression captures the hearts and minds of young listeners. Picture their eyes, widened as they’re drawn into the story.
Next time you deliver a presentation or a speech, think about the moments when you can raise your voice to capture the audience’s attention. Lower your voice to express emotion, reflection or thoughtfulness. And, remember to pause now and again to give the audience time to reflect on what you’ve said.
Tone, pitch, volume, along with pace and pauses, help to grab and engage your audience. Consider how you’ll add expression to your next speech.
