As u can see in the picture, the speed says 0.8 on the left but the slider shows its set to 1 https://cdn.discordapp.com/attachments/1379671046604718110/1379671047246184519/image.png?ex=6841164a&is=683fc4ca&hm=7b5fcda2a5634804f02d0b2a939c7f3baa2e7a432a2274298805c6bf3d8af4f9&

It looks like the speed value (0.8) and the slider (set to 1) are out of sync in your voice configuration UI. This may be a UI display issue, as the backend does support numeric speed values between -1 and 1 for precise control. Try refreshing the page or manually entering the desired speed value; if the mismatch persists, please contact Vapi support to report the UI inconsistency. For reference, the backend will honor the numeric value you set, even if the slider does not visually match it ([changelog](https://docs.vapi.ai/changelog/2025/4/3)). Source: - [Changelog April 3, 2025](https://docs.vapi.ai/changelog/2025/4/3)

Make sure you have saved any changes in the configuration dashboard also check if the changes are reflected in the system by verifying them in the appropriate configuration file or API call.