With ElevenLabs: split narration into 2–4 minute chunks, overlap 1–2 sentences to preserve prosody, and keep paragraph boundaries. Add explicit punctuation and SSML tags; expand numbers/abbreviations. Reduce any “stability/monotony” setting and slightly raise variability/temperature if available. Postprocess at 48 kHz/24-bit, target -16 LUFS, apply gentle multiband compression, de-ess, spectral repair for clicks, and 10–50 ms crossfades between chunks. Always test changes on short samples first.

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