Next time you deliver or write a speech the "voice" is key.  Read on…

VOICE

As you know, your voice is your most important tool when addressing an audience. How you present your words, the tone, the rhythm and the volume are all important aspects of speaking. Unfortunately, you’re not typically aware of all these elements when it actually comes time to deliver, so consider the following when rehearsing your speech.
Make sure you pronounce all your words clearly and correctly. If you’re not sure about the pronunciation of a word, ask someone who knows. This is especially true for peoples’ names. Altering the pacing of your speech and emphasizing the important words in sentences will go a long way to helping give your speech mood. It will also help distinguish some of the most important parts of your speech. Finally, avoid saying "uh" or "ah" when there are pauses in your speech.
If you stumble over some words, don’t panic. Mistakes happen. People are far more likely to forget about it if you give the matter as much thought as it deserves. If it’s a small mistake, merely move on. If it’s a more noticeable mistake, simply pause, back-up and say the word correctly. If you want to frame your correction appropriately, say "pardon me, I mean…" or "rather, that is…" or something to that effect. Don’t apologize profusely.