An article, Fin. Times, Nov. 2, 2005 at 8, describes how you can have a recording done of yourself speaking two minutes on four topics, and then a psychologist who specializes in linguistics uses software to compare your voice against an “ideal” voice. That comparison looks at pitch, articulation and fluency, and five other measures such as loudness, modulation (how much your pitch goes up and down), and “disfluencies” you let creep in such as “um” and “er.”.
A general counsel or senior lawyer who speaks frequently at public presentations might look into voice coaching. A coach, for example, might improve speed and clarity, or teach you about posture and breathing.