Local speech synthesis on a laptop, tested against the text that fills industrial documents. TL;DR Tested Qwen3-TTS 1.7B (Apache 2.0) on Apple Silicon against forty German sentences full of part numbers, acronyms, dates and currency. Raw text derails: the model stops mid-identifier and reads twenty seconds of unrelated fluent German, no error. A text rewrite layer removes that completely, and what's left sits in identifiers. Polly on the same sentences, raw: zero derailments, no rules....