# Velocity Flux — VoiceNet dimension guide

*Category:* Temporal Dynamics · *code:* `vn_VFLX` · *slot:* 68

This dimension measures the change in speaking speed over the duration of the clip. 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.** **Velocity Flux** controls the change in speaking speed over the duration of the clip. The **__high** LoRA shifts it +0.42 at 125% (worst cost: burst-blend -0.41); the **__low** LoRA shifts it -0.01 at 100% (worst cost: speech quality -0.14). The **__high** direction is the stronger, more reliable knob here.

## ▲ HIGH — Velocity Flux __high

| dose | target | Δtarget | Δgenu | Δblend | Δqual |
|---|---|---|---|---|---|
| baseline (0%) | 0.261 | — | — | — | — |
| 25% | 0.340 | +0.08 | -0.05 | +0.02 | +0.04 |
| 50% | 0.433 | +0.17 | -0.07 | -0.09 | +0.08 |
| 75% | 0.680 | +0.42 | -0.10 | -0.32 | -0.01 |
| 100% | 0.678 | +0.42 | -0.10 | -0.33 | -0.07 |
| 125% ★ | 0.684 | +0.42 | -0.09 | -0.41 | -0.17 |

- **EmoNet emotion** — ↑ Triumph (+0.54), Amusement (+0.50), Impatience and Irritability (+0.49); ↓ Longing (-0.55), Relief (-0.51), Fatigue/Exhaustion (-0.46)
- **VoiceNet dimension** — ↑ Pitch Range (+0.84), Head Resonance (+0.82), Dynamic Arc (+0.81); ↓ Cognitive Load (-0.82), Warmth (-0.67), Vulnerability (-0.66)

Merging **Velocity Flux __high** raises the dimension: at the recommended **125%** dose the measured Velocity Flux score moves from a 0.26 baseline to 0.68 (a +0.42 shift). The dose-response is clean and monotonic — each step pushes the dimension further. That reach is a steep cost — the biggest hit is to **burst-blend** (-0.41); across the board genuineness -0.09, burst-blend -0.41, speech quality -0.17. Emotionally it reads as Triumph (r 0.54), Amusement (0.50) and Impatience and Irritability (0.49), and it moves away from Longing, Relief and Fatigue/Exhaustion. On other voice dimensions it co-moves most with Pitch Range (0.84), Head Resonance (0.82) and Dynamic Arc (0.81), while pulling down Cognitive Load, Warmth and Vulnerability. Practical call: merge __high at **100–125%**; expect Triumph and Pitch Range to rise and burst-blend to fall. If you don’t want Triumph bleeding in, offset it with a prompt cue toward Longing to keep the velocity flux shift without the side-effect.

## ▼ LOW — Velocity Flux __low

| dose | target | Δtarget | Δgenu | Δblend | Δqual |
|---|---|---|---|---|---|
| baseline (0%) | 0.261 | — | — | — | — |
| 25% | 0.418 | +0.16 | -0.03 | +0.02 | +0.03 |
| 50% | 0.290 | +0.03 | +0.02 | -0.10 | -0.01 |
| 75% | 0.343 | +0.08 | -0.02 | -0.20 | -0.13 |
| 100% ★ | 0.255 | -0.01 | +0.06 | -0.12 | -0.14 |
| 125% | 0.297 | +0.04 | +0.01 | -0.07 | -0.24 |

- **EmoNet emotion** — ↑ Concentration (+0.38), Contemplation (+0.31), Emotional Numbness (+0.22); ↓ Fatigue/Exhaustion (-0.43), Bitterness (-0.32), Sadness (-0.31)
- **VoiceNet dimension** — ↑ Head Resonance (+0.64), Teacher/Didactic Style (+0.60), ASMR Style (+0.58); ↓ Genuineness (-0.58), Cognitive Load (-0.51), Perceived Gender (-0.44)

Merging **Velocity Flux __low** suppresses the dimension: at the recommended **100%** dose the measured Velocity Flux score moves from a 0.26 baseline to 0.26 (a -0.01 shift). The dose-response is mostly ordered but noisy between doses. That reach is a modest cost — the biggest hit is to **speech quality** (-0.14); across the board genuineness +0.06, burst-blend -0.12, speech quality -0.14. Emotionally it reads as Concentration (r 0.38), Contemplation (0.31) and Emotional Numbness (0.22), and it moves away from Fatigue/Exhaustion, Bitterness and Sadness. On other voice dimensions it co-moves most with Head Resonance (0.64), Teacher/Didactic Style (0.60) and ASMR Style (0.58), while pulling down Genuineness, Cognitive Load and Perceived Gender. Practical call: merge __low at **75–100%**; expect Concentration and Head Resonance to rise and speech quality to fall. If you don’t want Concentration bleeding in, offset it with a prompt cue toward Fatigue/Exhaustion to keep the velocity flux shift without the side-effect.

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