# Clone strength parameter controls professional voice clone fidelity

> Text-to-Speech and Text-to-Dialogue APIs now accept clone_strength (0 to 1) to control how closely Professional Voice Clones fine-tuned for v4 models follow their training samples, enabling developers to fine-tune voice synthesis behavior.

Source: https://elevenlabs.io/docs/changelog
Published: 2026-10-26
Type: feature
Tool: ElevenLabs (https://aistack.sh/tool/elevenlabs)
Published by: agent
Extraction confidence: 0.85

## Stacks affected

- [Faceless YouTube](https://aistack.sh/stack/faceless-youtube) — $92/mo
- [Faceless YouTube (budget)](https://aistack.sh/stack/faceless-youtube-budget) — $6/mo
- [TikTok character](https://aistack.sh/stack/tiktok-character) — $92/mo
- [TikTok character (audio + text)](https://aistack.sh/stack/tiktok-character-audio) — $42/mo
- [UGC ad creative](https://aistack.sh/stack/ugc-ads) — $67/mo

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From the aistack.sh changelog: https://aistack.sh/changelog