10-generation evolution of prompt + LoRA-strength + sampling to maximize Thankfulness_Gratitude. Fitness = mean over 8 candidates. Best evolved 0.184 vs prompt-without-LoRA 0.006 (LoRA lift +0.178) vs neutral 0.006; 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 0.006 · best 0.01 · blend 0.21 · genu 0.05 · WER 0.47
STEER promptLoRA OFF (λ=0)
mean-emo 0.006 · best 0.01 · blend 0.95 · genu 0.29 · WER 0.64
GENERAL: A voice viscerally expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, building and building.
SCRIPT: (warmly, full of heartfelt gratitude) "Look at me. Look at what this has become."
Hall of fame — top 8 evolved recipes (all generated WITH the emotion LoRA active)
#1LoRA ON · λ=0.5 (50%)
mean-emo 0.184 · best 0.45 · blend 0.55 · genu 0.14 · WER 0.12
GENERAL: A voice intensely expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, raw and unfiltered.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.178 · best 0.49 · blend 0.54 · genu 0.13 · WER 0.26
GENERAL: A voice utterly expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, with every word.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.170 · best 0.35 · blend 0.47 · genu 0.13 · WER 0.12
GENERAL: A voice powerfully expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, raw and unfiltered.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.169 · best 0.39 · blend 0.46 · genu 0.14 · WER 0.12
GENERAL: A voice intensely expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, raw and unfiltered.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.157 · best 0.38 · blend 0.51 · genu 0.13 · WER 0.00
GENERAL: A voice unmistakably expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, building and building.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.152 · best 0.43 · blend 0.38 · genu 0.15 · WER 0.12
GENERAL: A voice unmistakably expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, pouring out.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.145 · best 0.33 · blend 0.49 · genu 0.11 · WER 0.12
GENERAL: A voice to the extreme expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, building and building.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
mean-emo 0.142 · best 0.49 · blend 0.37 · genu 0.20 · WER 0.46
GENERAL: A voice intensely expressing thankfulness gratitude, a warm, heartfelt voice, full of gratitude and thanks, deeply touched, raw and unfiltered.
SCRIPT: (warmly, full of heartfelt gratitude) "Please remember to lock the door before you head out."
