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arXiv · 2603.13518

VoXtream2: Full-stream TTS with dynamic speaking rate control

Nikita Torgashov·Gustav Eje Henter·Gabriel Skantze
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Abstract

Full-stream text-to-speech (TTS) for interactive systems must start speaking with minimal delay while remaining controllable as text arrives incrementally. We present VoXtream2, a zero-shot full-stream TTS model with dynamic speaking-rate control that can be updated mid-utterance on the fly. VoXtream2 combines a distribution matching mechanism over duration states with classifier-free guidance across conditioning signals to improve controllability and synthesis quality. Prompt-text masking enables textless audio prompting, removing the need for prompt transcription. Across standard zero-shot benchmarks and a dedicated speaking-rate test set, VoXtream2 achieves competitive objective and subjective results against public baselines despite a smaller model and less training data. In full-stream mode, it runs 4 times faster than real time with 74 ms first-packet latency on a consumer GPU.

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BibTeXRIS

Nikita Torgashov, Gustav Eje Henter, Gabriel Skantze. 2026-03-13. VoXtream2: Full-stream TTS with dynamic speaking rate control. https://arxiv.org/abs/2603.13518

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