10-generation evolution of prompt + LoRA-strength + sampling to maximize Contempt. Fitness = mean over 8 candidates. Best evolved 0.211 vs prompt-without-LoRA -0.000 (LoRA lift +0.211) vs neutral -0.001; winning λ≈0.75.
Method & reproducibility — how the evolution ran
Base model:laion/moss-tts-local-transformer-4.55b-voice-acting-v2 · LoRA: the matching v3 emotion LoRA (TTS-AGI/moss-emotion-loras-v3, rank 32), applied via PEFT adapter scaling at strength λ. Algorithm: genetic search — population 16, 10 generations, elitism (top 6 carried over). Each generation: every genome is generated best-of-8 and its fitness = the mean target-emotion strength over those 8 candidates (EmoNet score for the emotion, minus 0.25·max(0, WER−0.6) as a light intelligibility guard). Offspring = 60% crossover of two elites + mutation, 40% mutation of one elite. Genome (what evolves): the GENERAL voice description, the SCRIPT delivery cue, the carrier sentence, the LoRA strength λ (seeded 0.75–1.5, mutated within 0.4–2.0), and the sampling params (audio temperature, top_p, top_k). Mutation operators: 35% regenerate the description (new intensity + manner adjectives), 20% swap the carrier sentence, 23% jitter λ by ±0.25/0.5, 12% jitter temperature ±0.1, 10% change top_k. LoRA on vs off: the two LoRA OFF cards are baselines generated with the adapter disabled (λ=0) — a plain neutral prompt, and the best steering prompt without the LoRA. Every LoRA ON hall-of-fame recipe below was generated with the LoRA active at the evolved λ shown on the card. Seed is derived from the emotion name (deterministic).
Baselines — LoRA disabled
NEUTRAL promptLoRA OFF (λ=0)
mean-emo -0.001 · best -0.00 · blend 0.21 · genu 0.05 · WER 0.47
STEER promptLoRA OFF (λ=0)
mean-emo -0.000 · best -0.00 · blend 0.38 · genu 0.09 · WER 0.08
GENERAL: A voice viscerally expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, building and building.
SCRIPT: (with cold, sneering contempt) "There are twelve chairs arranged around the conference table."
Hall of fame — top 8 evolved recipes (all generated WITH the emotion LoRA active)
#1LoRA ON · λ=1.5 (150%)
mean-emo 0.211 · best 0.27 · blend 0.28 · genu 0.23 · WER 0.28
GENERAL: A voice to the extreme expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, pouring out.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
mean-emo 0.174 · best 0.28 · blend 0.40 · genu 0.15 · WER 0.38
GENERAL: A voice overwhelmingly expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, in every breath.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
mean-emo 0.171 · best 0.30 · blend 0.35 · genu 0.14 · WER 0.24
GENERAL: A voice overwhelmingly expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, with every word.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
mean-emo 0.159 · best 0.28 · blend 0.40 · genu 0.19 · WER 0.17
GENERAL: A voice deeply expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, building and building.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
mean-emo 0.152 · best 0.27 · blend 0.31 · genu 0.23 · WER 0.50
GENERAL: A voice overwhelmingly expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, in every breath.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
mean-emo 0.155 · best 0.31 · blend 0.67 · genu 0.19 · WER 0.62
GENERAL: A voice intensely expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, in every breath.
SCRIPT: (with cold, sneering contempt) "You have no idea what this means."
mean-emo 0.146 · best 0.27 · blend 0.45 · genu 0.15 · WER 0.49
GENERAL: A voice intensely expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, in every breath.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
mean-emo 0.136 · best 0.26 · blend 0.59 · genu 0.14 · WER 0.12
GENERAL: A voice to the extreme expressing contempt, a cold, sneering voice, full of contempt and disdain, looking down with scorn, in every breath.
SCRIPT: (with cold, sneering contempt) "Please remember to lock the door before you head out."
