Principle

Sound

These are the rules for the robot's sound: one source sound per behavior.Emotion is pitch and tempo; timbre is the robot's character. Evidence: heuristic.

One source sound

Every emotional variation comes from the behavior's one source sound.

Emotion = pitch + tempo

Up = positive or question, down = negative or closing. Fast = energy, slow = weight.
Timbre is the robot's character. It never changes per emotion and is never mixed.

Emotion variations

Excited

Variation+5 st · 1.4×

Curious

Variation+2 st · rising end

Worried

Variation−3 st · slower

Sad

Variation−6 st · fades out

Order and frequency

Sound comes first, then face, then body, 0.1 s apart. It ends with a 1 s fade.

Sound0 s

Leads by 0.1 s

Face+0.1 s

Then the face

Body+0.2 s

1 s fade at the end

Frequency

≤ 2 / 10 s≥ 0.8 s

At most 2 per 10 s, at least 0.8 s apart

No speaker

2 channels kept

Positive → body + face as is Negative → face if any, otherwise skip

Don’t

Don't Change Timbre per EmotionTimbre is the robot's character. Emotion moves pitch and tempo only.

Don't Sound on Every GlanceNo sound for every gaze shift; fewer during quiet hours.

Don't Go Past 1.4×Faster than 1.4× reads as an alarm. No fast sound on a slow motion.