# Brightness — VoiceNet dimension guide

*Category:* Spectral & Timbral · *code:* `vn_BRGT` · *slot:* 61

This dimension measures the prominence of high-frequency energy in the voice. Merge the `__high` / `__low` LoRA from `laion/moss-voicenet-dimension-loras` at 25/50/75/100/125%. Costs are shifts vs. the 24-sample neutral baseline.

**TL;DR.** **Brightness** controls the prominence of high-frequency energy in the voice. The **__high** LoRA shifts it +0.30 at 100% (worst cost: burst-blend -0.20); the **__low** LoRA shifts it -0.04 at 50% (worst cost: speech quality -0.07). The **__high** direction is the stronger, more reliable knob here.

## ▲ HIGH — Brightness __high

| dose | target | Δtarget | Δgenu | Δblend | Δqual |
|---|---|---|---|---|---|
| baseline (0%) | 0.177 | — | — | — | — |
| 25% | 0.197 | +0.02 | +0.04 | -0.13 | -0.13 |
| 50% | 0.238 | +0.06 | -0.06 | -0.12 | +0.06 |
| 75% | 0.283 | +0.11 | -0.04 | -0.14 | -0.03 |
| 100% ★ | 0.479 | +0.30 | -0.05 | -0.20 | +0.06 |
| 125% | 0.416 | +0.24 | -0.05 | -0.33 | -0.07 |

- **EmoNet emotion** — ↑ Hope/Enthusiasm/Optimism (+0.44), Elation (+0.44), Pleasure/Ecstasy (+0.43); ↓ Longing (-0.42), Helplessness (-0.40), Fear (-0.40)
- **VoiceNet dimension** — ↑ Arousal (+0.85), Mask Resonance (+0.84), Chunking (+0.83); ↓ Perceived Gender (-0.65), Cognitive Load (-0.63), Vulnerability (-0.52)

Merging **Brightness __high** drives the dimension: at the recommended **100%** dose the measured Brightness score moves from a 0.18 baseline to 0.48 (a +0.30 shift). The dose-response is clean and monotonic — each step pushes the dimension further. That reach is a real cost — the biggest hit is to **burst-blend** (-0.20); across the board genuineness -0.05, burst-blend -0.20, speech quality +0.06. Emotionally it reads as Hope/Enthusiasm/Optimism (r 0.44), Elation (0.44) and Pleasure/Ecstasy (0.43), and it moves away from Longing, Helplessness and Fear. On other voice dimensions it co-moves most with Arousal (0.85), Mask Resonance (0.84) and Chunking (0.83), while pulling down Perceived Gender, Cognitive Load and Vulnerability. Practical call: merge __high at **75–100%**; expect Hope/Enthusiasm/Optimism and Arousal to rise and burst-blend to fall. If you don’t want Hope/Enthusiasm/Optimism bleeding in, offset it with a prompt cue toward Longing to keep the brightness shift without the side-effect.

## ▼ LOW — Brightness __low

| dose | target | Δtarget | Δgenu | Δblend | Δqual |
|---|---|---|---|---|---|
| baseline (0%) | 0.177 | — | — | — | — |
| 25% | 0.161 | -0.02 | -0.02 | -0.11 | -0.01 |
| 50% ★ | 0.140 | -0.04 | +0.02 | -0.06 | -0.07 |
| 75% | 0.199 | +0.02 | -0.06 | -0.13 | +0.04 |
| 100% | 0.142 | -0.04 | -0.05 | -0.17 | -0.07 |
| 125% | 0.162 | -0.01 | -0.02 | -0.10 | -0.11 |

- **EmoNet emotion** — ↑ Amusement (+0.31), Contentment (+0.27), Hope/Enthusiasm/Optimism (+0.20); ↓ Fear (-0.28), Anger (-0.28), Pride (-0.23)
- **VoiceNet dimension** — ↑ Head Resonance (+0.66), Mask Resonance (+0.66), Register (+0.57); ↓ Perceived Gender (-0.47), Disfluency (-0.40), Cognitive Load (-0.40)

Merging **Brightness __low** dials back the dimension: at the recommended **50%** dose the measured Brightness score moves from a 0.18 baseline to 0.14 (a -0.04 shift). The dose-response is mostly ordered but noisy between doses. That reach is a modest cost — the biggest hit is to **speech quality** (-0.07); across the board genuineness +0.02, burst-blend -0.06, speech quality -0.07. Emotionally it reads as Amusement (r 0.31), Contentment (0.27) and Hope/Enthusiasm/Optimism (0.20), and it moves away from Fear, Anger and Pride. On other voice dimensions it co-moves most with Head Resonance (0.66), Mask Resonance (0.66) and Register (0.57), while pulling down Perceived Gender, Disfluency and Cognitive Load. Practical call: merge __low at **25–75%**; expect Amusement and Head Resonance to rise and speech quality to fall. If you don’t want Amusement bleeding in, offset it with a prompt cue toward Fear to keep the brightness shift without the side-effect.

---
[← all dimensions](index.md) · [human/audio version](../../site/dims/BRGT.html)