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arXiv · 2509.05863

LatinX: Aligning a Multilingual TTS Model with Direct Preference Optimization

Luis Felipe Chary·Miguel Arjona Ramirez
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Abstract

We present LatinX, a multilingual text-to-speech (TTS) model for cascaded speech-to-speech translation that preserves the source speaker's identity across languages. LatinX is a 12-layer decoder-only Transformer trained in three stages: (i) pre-training for text-to-audio mapping, (ii) supervised fine-tuning for zero-shot voice cloning, and (iii) alignment with Direct Preference Optimization (DPO) using automatically labeled pairs based on Word Error Rate (WER) and speaker-similarity metrics. Trained on English and Romance languages with emphasis on Portuguese, LatinX with DPO consistently reduces WER and improves objective similarity over the fine-tuned baseline. Human evaluations further indicate stronger perceived speaker similarity than a strong baseline (XTTSv2), revealing gaps between objective and subjective measures. We provide cross-lingual analyses and discuss balanced preference signals and lower-latency architectures as future work.

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Luis Felipe Chary, Miguel Arjona Ramirez. 2025-09-06. LatinX: Aligning a Multilingual TTS Model with Direct Preference Optimization. https://arxiv.org/abs/2509.05863

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