Pitch, Intonation and Volume

After pace, three settings shape the color of your voice: pitch (low/high), intonation (the melody of your sentences) and volume (loud/soft). They're what make a voice sound confident or hesitant, warm or flat, credible or fragile. Julian Treasure groups them into what he calls the "vocal toolbox" — a set of levers any speaker can learn to operate.

"We all have an incredibly powerful instrument, and most of us don't know how to use it." — Julian Treasure.

Pitch: speaking from the chest

Pitch is the frequency of your voice, from low to high. Under stress, the vocal cords tighten and the voice rises: it sounds youthful, anxious, less authoritative. Conversely, a voice anchored in the chest register (the low resonance you feel vibrating in your thorax) is perceived as steadier and more credible.

It's not about faking an artificially deep voice, but about relaxing the throat and breathing low (Chapter 2) to let the voice drop to its natural pitch. Actor's trick: a soft closed-mouth "mmm-hmm," feeling the vibration in your chest, gives you your reference note before you speak.

Intonation: the melody that changes everything

Intonation (prosody) is the melodic curve of your sentence. Two opposite movements carry opposite messages:

Uptalk (ending statements like questions) is one of the most common forms of self-sabotage. "I think we should launch the project?" sounds like a request for permission. The same sentence, voice falling on "project," becomes a solid recommendation. Reserve rising intonation for real questions.

Beware the opposite trap: an always-falling, flat intonation becomes monotone — guaranteed boredom. A living voice varies its melody constantly. Monotony isn't a sign of seriousness; it's a sign of absent engagement.

Volume: occupying the sound space

Volume signals energy and confidence. Speaking too softly forces the audience to strain and conveys self-effacement; speaking too loudly tires people and seems aggressive. The practical rule: be audible to the most distant person without shouting, leaning on your breath, not your throat (otherwise you'll wreck your voice).

Like pace, volume is above all a tool of contrast. Suddenly dropping the volume on a confidence ("and here's what no one tells you…") creates an intimacy that grabs attention better than a shout. Great speakers alternate full passages and near-whispers.

Julian Treasure's vocal toolbox

Treasure summarizes six levers you can set independently, like the knobs on a mixing console:

flowchart TD
    V["Your voice"] --> R["Register<br/>(chest = authority)"]
    V --> T["Timbre<br/>(warmth of the grain)"]
    V --> P["Prosody<br/>(melody, avoid monotone)"]
    V --> D["Pace<br/>(vary the speed)"]
    V --> H["Pitch<br/>(avoid uptalk)"]
    V --> Vo["Volume<br/>(contrast, not shouting)"]

In his talk, he also lists the "seven deadly sins of speaking" to avoid: gossip, judging, negativity, complaining, excuses, exaggeration and dogmatism — because content undermines the credibility the voice builds. Form and substance must go together.

Pitch, authority and bias: a moment of clarity

Research shows associations between a low voice and the perception of leadership (for example Klofstad et al.'s work on political candidates' voices, perceived as more competent when lower). These effects are real, but they partly reflect cultural and gender biases. The goal of this module is not to make you conform to a stereotype, but to give you control: dropping your voice through breathing when you choose to, rather than letting it rise under stress.

Say / don't say

• Don't: "We finished the report? And I think it's pretty good?" (two uptalks → people doubt you).
• Do: "We finished the report. (voice falls) And it's good. (volume lowered, steady)" (two anchored statements).

Practical exercise

Pick a professional statement ("I recommend option B."). Say it three times while recording: (1) voice rising on "B," (2) flat, monotone voice, (3) voice falling on "B" with a slight drop in volume. Listen back: the third version is almost always the one that "carries authority." You've just isolated the effect of intonation.

Summary

Three settings color the voice. Pitch: anchored in the chest register (through breathing), it lays down authority; under stress it rises and weakens you. Intonation: falling = statement, rising (uptalk) = doubt — but never monotone. Volume: audible without shouting, and powerful above all through contrast. Treasure's vocal toolbox (register, timbre, prosody, pace, pitch, volume) sums up the levers, provided you avoid the content "sins." Finally, these effects carry biases: the point is to control your voice, not to conform to a stereotype.