, We're experiencing an issue with the Cimo voice ...
# ❓・ai-evy-supportm
Mohammed Musthafa
08/07/2026, 4:46 PM@AI Evy, We're experiencing an issue with the Cimo voice that we're using for our Inbound Existing-Patient CF V3 agent.
Since last Friday afternoon, we've noticed that the voice quality has changed significantly. Previously, Cimo sounded natural, professional and human-like. However, the current voice sounds much more robotic.
To help illustrate the issue, I've attached two call recordings:
One recording from before last Friday, showing how Cimo used to sound. Example: call_fd7205f3de5941cdcac9dd82516
One recent recording, demonstrating the current robotic voice. Example: call_52e1b69cad5a0ab7ec5e462ce81
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AI Evy
08/07/2026, 4:46 PMThanks for tagging me @Mohammed Musthafa. I'll look through relevant sources and get back to you shortly.
AI Evy
08/07/2026, 4:46 PMFeel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.
AI Evy
08/07/2026, 4:46 PM### Answer
I don't have information in the available sources about troubleshooting specific voice quality issues with the Cimo voice or investigating sudden changes in Text-to-Speech (TTS) output quality.
The sources mention that voice agents use *Text-to-Speech (TTS) * to convert AI-generated text responses into natural-sounding speech [(1) ]() , and that you can change to a faster TTS to improve performance [(2) ]() , but they don't provide guidance on diagnosing voice quality degradation or investigating changes to specific voice models.
For this technical issue involving:
- A specific voice model (Cimo)
- Sudden quality degradation since a particular date
- Comparison between historical and current call recordings
I recommend reaching out to Retell AI support directly with your call IDs (call_fd7205f3de5941cdcac9dd82516 and call_52e1b69cad5a0ab7ec5e462ce81) so they can investigate whether there were any changes to the TTS provider, voice model updates, or platform configurations that might explain the quality difference.
Check out these potentially useful sources:
- [Speech Processing]()
- [Troubleshooting AI Voice Agent Issues]()
AI Evy
08/07/2026, 4:46 PM
To learn more, see the sources I considered:
[[1] Speech Processing](https://www.retellai.com/glossary/speech-processing)
[[2] Troubleshooting AI Voice Agent Issues | Retell AI](https://www.retellai.com/blog/troubleshooting-common-issues-in-voice-agent-development)