Evolving prompt+sampling to push VoiceNet dimension ARSH in the high direction with the vn_ARSH__high LoRA. Steering phrase: a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.
Best in-direction score 0.901 at 100% vs neutral 0.480 (shift +0.421).
Method & reproducibility — how the evolution ran
Base model:laion/moss-tts-local-transformer-4.55b-voice-acting-v2 · LoRA: the new VoiceNet-dimension LoRAvn_<CODE>__<high|low> (retrained with ≤25% game-character data, rank 32), applied via PEFT adapter scaling at strength λ. Algorithm: genetic search — population 12, 10 generations, elitism (top 5). During evolution every genome is generated best-of-6with the LoRA at λ=100%; its fitness = the mean over those 6 candidates of the target VoiceNet dimension score in the intended direction (for a __high LoRA the raw score; for __low, 1−score), minus 0.2·max(0, WER−0.6). Genome (what evolves): the GENERAL voice description, the SCRIPT cue, the carrier sentence, and the sampling params (temperature, top_p, top_k). λ is fixed at 100% during the search. Mutation operators: 40% regenerate description, 25% swap carrier, 17% jitter temperature ±0.1, 18% change top_k. Offspring = 60% crossover + mutation, 40% mutation. Dose measurement (below): the winning recipe is then re-generated at λ=0 (LoRA OFF), λ=50% and λ=100% (each best-of-6) to show exactly what 50% vs 100% of the LoRA brings over the no-LoRA baseline.
Dose — what 50% vs 100% brings (top recipe)
λ=0 (no LoRA) — dir 0.310 (raw 0.31)
WER 0.09 · genu 0.07
λ=50% — dir 0.462 (raw 0.46)
WER 0.09 · genu 0.05
λ=100% — dir 0.901 (raw 0.90)
WER 0.44 · genu 0.09
GENERAL: A voice that is strongly a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.
SCRIPT: (distinctly a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable) "The train leaves from platform four every hour on the hour." · temp 1.05 top_p 0.95 top_k 30
Other evolved recipes (100%)
— dir 0.882 (raw 0.88)
WER 0.15 · genu 0.10
A voice that is distinctly a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.
— dir 0.876 (raw 0.88)
WER 0.42 · genu 0.13
A voice that is distinctly a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.
— dir 0.874 (raw 0.87)
WER 0.26 · genu 0.07
A voice that is strongly a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.
— dir 0.861 (raw 0.86)
WER 0.59 · genu 0.06
A voice that is markedly a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.
— dir 0.860 (raw 0.86)
WER 0.09 · genu 0.11
A voice that is extremely a voice with strongly pronounced arousal shift, arousal shift-forward and unmistakable.