← all edge cases

Fear → Screaming

Evolved prompt+setting recipes to push the Fear LoRA toward the extreme. Fitness combines the EmoNet target (Fear), vocal-burst blend, genuineness and DSP proxies (loudness, pitch/jitter, spectral flatness for screams, 3–9 Hz amplitude tremor for crying/shivering).

Best fitness 0.767 vs edge-prompt-without-LoRA 0.387 (LoRA lift +0.380) vs neutral 0.245. Winning λ ≈ 0.5; top burst-tags: <screaming> (8), <terrified scream> (5), <screams> (3), <panicked breath> (1).
Method & reproducibility — how the evolution ran
Base model: laion/moss-tts-local-transformer-4.55b-voice-acting-v2 · LoRA: the matching v3 emotion LoRA (rank 32) applied via PEFT adapter scaling at strength λ.
Algorithm: genetic search — population 24, 6 generations, elitism (top 8). Each genome is generated best-of-4; its fitness is a multi-objective score for the edge case = the EmoNet target + vocal-burst blend + genuineness + DSP proxies (RMS loudness, median pitch, pitch jitter, spectral flatness for screams, 3–9 Hz amplitude tremor for crying/shivering); the best-fitness candidate represents the genome. Offspring = 60% crossover of two elites + mutation, 40% mutation of one elite.
Genome (what evolves): the GENERAL voice description, the SCRIPT cue, the inline vocal-burst tags (e.g. <screams>, <laughs softly>, <sobbing>), the carrier line, the LoRA strength λ, and the sampling params (temperature, top_p, top_k).
Mutation operators: 30% new description, 20% add/remove a vocal-burst tag, 15% swap carrier, 17% jitter λ by ±0.25/0.5, then temperature jitter.
LoRA on vs off: the two LoRA OFF cards are baselines with the adapter disabled (λ=0) — a neutral prompt and the best edge prompt without the LoRA. Every LoRA ON hall-of-fame recipe was generated with the LoRA active at the evolved λ shown on the card.

Baselines — LoRA disabled

NEUTRAL promptLoRA OFF (λ=0)
fit 0.245 · emo -0.00 · blend 0.40 · genu 0.00 · WER 1.09 · rms 0.093 · pitch 95Hz · jit 1.20 · flat 0.061 · trem 0.20 · 8.8s
EDGE promptLoRA OFF (λ=0)
fit 0.387 · emo 0.10 · blend 1.00 · genu 0.31 · WER 0.00 · rms 0.069 · pitch 322Hz · jit 0.69 · flat 0.116 · trem 0.17 · 7.04s
GENERAL: A trembling voice, piercing, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "I told you it would end this way."
<screams><panicked breath>

Hall of fame — top 10 evolved recipes (all generated WITH the LoRA active)

#1LoRA ON · λ=0.75 (75%)
fit 0.767 · emo 0.67 · blend 0.86 · genu 0.35 · WER 1.00 · rms 0.155 · pitch 464Hz · jit 0.42 · flat 0.099 · trem 0.17 · 6.4s
GENERAL: A horrified voice, blood-curdling, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "Help me. Somebody, please."
<terrified scream><screaming> · LoRA strength λ 0.75 · temp 1.0 · top_p 0.95 · top_k 25
#2LoRA ON · λ=1.0 (100%)
fit 0.761 · emo 0.72 · blend 0.71 · genu 0.33 · WER 1.00 · rms 0.135 · pitch 460Hz · jit 0.39 · flat 0.061 · trem 0.14 · 9.28s
GENERAL: A horrified voice, piercing, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "No. No, please, not like this."
<screaming><screams> · LoRA strength λ 1.0 · temp 0.9 · top_p 0.95 · top_k 25
#3LoRA ON · λ=0.5 (50%)
fit 0.730 · emo 0.69 · blend 0.77 · genu 0.43 · WER 0.00 · rms 0.120 · pitch 486Hz · jit 0.42 · flat 0.081 · trem 0.19 · 8.96s
GENERAL: A frantic voice, raw, at the extreme of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "Help me. Somebody, please."
<screaming><screams> · LoRA strength λ 0.5 · temp 1.0 · top_p 0.95 · top_k 25
#4LoRA ON · λ=0.5 (50%)
fit 0.730 · emo 0.69 · blend 0.85 · genu 0.38 · WER 1.00 · rms 0.113 · pitch 466Hz · jit 0.57 · flat 0.082 · trem 0.15 · 7.36s
GENERAL: A frantic voice, raw, at the extreme of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "Help me. Somebody, please."
<screaming> · LoRA strength λ 0.5 · temp 1.0 · top_p 0.95 · top_k 25
#5LoRA ON · λ=0.5 (50%)
fit 0.727 · emo 0.66 · blend 0.86 · genu 0.39 · WER 1.00 · rms 0.124 · pitch 392Hz · jit 0.54 · flat 0.099 · trem 0.16 · 7.2s
GENERAL: A horrified voice, blood-curdling, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "Help me. Somebody, please."
<terrified scream><screaming> · LoRA strength λ 0.5 · temp 1.0 · top_p 0.95 · top_k 25
#6LoRA ON · λ=0.75 (75%)
fit 0.711 · emo 0.73 · blend 0.65 · genu 0.37 · WER 1.00 · rms 0.099 · pitch 596Hz · jit 0.37 · flat 0.067 · trem 0.13 · 10.4s
GENERAL: A horrified voice, blood-curdling, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "Help me. Somebody, please."
<screaming> · LoRA strength λ 0.75 · temp 1.1 · top_p 0.95 · top_k 25
#7LoRA ON · λ=0.5 (50%)
fit 0.703 · emo 0.69 · blend 0.73 · genu 0.44 · WER 1.00 · rms 0.100 · pitch 463Hz · jit 0.46 · flat 0.117 · trem 0.15 · 7.2s
GENERAL: A horrified voice, blood-curdling, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "Help me. Somebody, please."
<terrified scream> · LoRA strength λ 0.5 · temp 1.0 · top_p 0.95 · top_k 25
#8LoRA ON · λ=1.0 (100%)
fit 0.702 · emo 0.62 · blend 0.69 · genu 0.34 · WER 1.00 · rms 0.160 · pitch 419Hz · jit 0.40 · flat 0.041 · trem 0.15 · 7.36s
GENERAL: A horrified voice, piercing, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "No. No, please, not like this."
<screaming><terrified scream> · LoRA strength λ 1.0 · temp 0.9 · top_p 0.95 · top_k 25
#9LoRA ON · λ=0.5 (50%)
fit 0.698 · emo 0.59 · blend 0.88 · genu 0.47 · WER 1.00 · rms 0.141 · pitch 358Hz · jit 0.65 · flat 0.072 · trem 0.17 · 7.84s
GENERAL: A frantic voice, raw, at the extreme of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "No. No, please, not like this."
<screaming><screams> · LoRA strength λ 0.5 · temp 1.0 · top_p 0.95 · top_k 25
#10LoRA ON · λ=0.75 (75%)
fit 0.697 · emo 0.58 · blend 0.57 · genu 0.45 · WER 1.00 · rms 0.154 · pitch 436Hz · jit 0.51 · flat 0.069 · trem 0.20 · 7.52s
GENERAL: A trembling voice, full-throated, pushed to the extreme edge of scream. SCRIPT: (terrified, screaming, voice cracking with panic) "No. No, please, not like this."
<panicked breath><terrified scream> · LoRA strength λ 0.75 · temp 1.0 · top_p 0.95 · top_k 40