# PWR-148 — Vocal timbre control: learner worksheet Release: Revision 7T · Full Tutorial Edition Estimated time: Estimated 14 min reading; practical time is provider-set Difficulty: Intermediate Equipment: Common household or practice equipment — a voice-professional-led timbre exploration in a comfortable range.; A professional live model or approved recording, piano/tuner, microphone and level-matched playback.; A comparison sheet for listener label, pitch, level, effort, symptom and spectral display if the provider uses one. Space: Room-scale practice space Automated structural checklist: 10 of 10 structural checks present Evidence quality/context: G4; Detailed research depth Automated method-quality band: Comprehensive Method-rating basis: Structure coverage, instruction/check specificity, alternative distinctness, source troubleshooting, comparison depth and whether purpose/check fields are authored rather than derived. Editorial review: Pending manual editorial sign off ## Before you begin - [ ] I read the tutorial authority and stop conditions. - [ ] I have the required equipment/space or a declared accessible alternative. ## Canonical source context This lesson teaches a supervised timbre exploration. Timbre means the quality or colour that distinguishes sounds at the same pitch and loudness. You will use neutral labels, copy a professional model gently, change one resonance cue, compare recordings and stop for strain. It is not a public recipe for extreme vocal effects. Target outcome: Under voice-professional supervision, the learner produces two recognisably different comfortable timbres on the same phrase and pitch without increased symptoms. ### Authority and setup conditions - Prepare a voice-professional-led contrast between two comfortable timbres on one neutral phrase inside an easy range - Before the first vocal timbre control attempt, write the exact result you will score: Acoustic spectrum plus laryngeal/effort and blinded style-appropriate judgement, with symptoms and assistance declared. - The professional checks ordinary voice, hearing access, chosen style and whether the requested sound is culturally appropriate. - Use non-judgemental labels such as brighter/darker or more/less resonant; never label a natural voice defective. ### Required or supplied materials - a voice-professional-led timbre exploration in a comfortable range. - A professional live model or approved recording, piano/tuner, microphone and level-matched playback. - A comparison sheet for listener label, pitch, level, effort, symptom and spectral display if the provider uses one. ## 1. Hold the base constant Choose one easy pitch, comfortable level and five-word neutral phrase. Record the base version once. Why: Timbre cannot be compared if pitch, words and loudness all change. Success check: The provider confirms pitch, phrase and level are suitable and repeatable. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “The provider confirms pitch, phrase and level are suitable and repeatable.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 2. Hear two models Listen to the professional produce timbre A and B on the same base. Describe the contrast with neutral sound words, not anatomy guesses. Why: A clear auditory target precedes safe controlled variation. Success check: The learner identifies an audible contrast without calling either voice better. Accessible alternative: A visible, captioned or haptic version of “Listen to the professional produce timbre A and B on the same base. Describe the contrast with neutral sound words, not anatomy guesses.” can rehearse the response sequence, but it removes the declared auditory stimulus and is therefore a related activity, not an equivalent attempt at Vocal timbre control. To preserve the target, keep the authored sound and adapt only non-target access such as response input, instructions, breaks or support; retain this success check: “The learner identifies an audible contrast without calling either voice better.” Alternative relationship: Related alternative changes trained or measured target Learner notes: ________________________________________________________________________________ Completed: [ ] ## 3. Choose one approved cue Use the provider’s single cue, such as a slightly different vowel focus or oral resonance sensation. Keep throat and jaw comfortable. Why: One cue allows the sound change to be traced and stopped. Success check: Only the approved cue changes and the learner can release it immediately. Accessible alternative: A visible, captioned or haptic version of “Use the provider’s single cue, such as a slightly different vowel focus or oral resonance sensation. Keep throat and jaw comfortable.” can rehearse the response sequence, but it removes the declared auditory stimulus and is therefore a related activity, not an equivalent attempt at Vocal timbre control. To preserve the target, keep the authored sound and adapt only non-target access such as response input, instructions, breaks or support; retain this success check: “Only the approved cue changes and the learner can release it immediately.” Alternative relationship: Related alternative changes trained or measured target Learner notes: ________________________________________________________________________________ Completed: [ ] ## 4. Produce a short sample Say the phrase once in timbre A for no more than three seconds, rest, then say it once in timbre B. Why: Short separated samples reduce load and make comparison cleaner. Success check: Both samples keep the target pitch and words without pain or squeeze. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Both samples keep the target pitch and words without pain or squeeze.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 5. Match level before judging Play both recordings at matched volume. The listener labels A or B and notes what was heard; do not reward the louder sample. Why: Loudness can be mistaken for timbre difference. Success check: In four concealed, level-matched samples, the listener labels at least three correctly. Accessible alternative: A visible, captioned or haptic version of “Play both recordings at matched volume. The listener labels A or B and notes what was heard; do not reward the louder sample.” can rehearse the response sequence, but it removes the declared auditory stimulus and is therefore a related activity, not an equivalent attempt at Vocal timbre control. To preserve the target, keep the authored sound and adapt only non-target access such as response input, instructions, breaks or support; retain this success check: “In four concealed, level-matched samples, the listener labels at least three correctly.” Alternative relationship: Related alternative changes trained or measured target Learner notes: ________________________________________________________________________________ Completed: [ ] ## 6. Check effort and symptoms Rate effort, throat sensation and next-day voice change. Stop the contrast if either sample increases roughness, pain or fatigue. Why: A recognisable sound is not acceptable when bodily cost rises. Success check: Both timbres remain at the professional-approved effort with no new symptom. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Both timbres remain at the professional-approved effort with no new symptom.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 7. Repeat with a new phrase Use one matched neutral phrase while holding pitch and level. The provider decides whether the contrast is stable enough to repeat. Why: A new phrase tests control beyond memory for one sound sequence. Success check: The listener still recognises the contrast and the learner releases the cue after each sample. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “The listener still recognises the contrast and the learner releases the cue after each sample.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## 8. Close with a neutral voice Finish with one easy conversational phrase and a rest. Report any delayed change later the same day or next morning. Why: Returning to ordinary use makes residual tension or fatigue easier to notice. Success check: Conversational voice feels and sounds unchanged from the baseline. Accessible alternative: Ask the qualified provider to adapt positioning, cue modality, pace, interface or rest while preserving this step’s declared check: “Conversational voice feels and sounds unchanged from the baseline.” If an adaptation changes the measured task or configuration, record it as a different configuration rather than an equivalent attempt. Alternative relationship: Conditional equivalence requires target and configuration check Learner notes: ________________________________________________________________________________ Completed: [ ] ## Reflection What changed? ________________________________________________________________________________ What remains difficult? ________________________________________________________________________________ What will I repeat, adapt, ask for help with, or stop? ________________________________________________________________________________ --- Completion of this worksheet demonstrates tutorial participation only. It does not establish capability, qualification, safety clearance, diagnosis, treatment or independent validation.