# Voice Engine Glitch

**URL:** <https://community.retellai.com/t/voice-engine-glitch/3385>\
**Category:** Support Help\
**Tags:** bug\
**Created:** [July 20, 2026, 5:23pm UTC](https://community.retellai.com/t/voice-engine-glitch/3385 "2026-07-20T17:23:32Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![george1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/george1/32/217_2.png) [@george1](https://community.retellai.com/u/george1)\
**Post date:** [July 20, 2026, 5:23pm UTC](https://community.retellai.com/t/voice-engine-glitch/3385/1 "2026-07-20T17:23:32Z")

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Hello! I’ve noticed in a significant amount of our calls that the voice engine will glitch and sometimes merge words together or speak garbled. See calls below. How do we fix that?

call\_9f0f72d8c059a3b813ea0013452  
call\_3b66267e9c9bb61b7def4e447da

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**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [July 20, 2026, 5:34pm UTC](https://community.retellai.com/t/voice-engine-glitch/3385/2 "2026-07-20T17:34:25Z")

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Hey @george1 Thanks for the details. I’m checking your Call IDs with the team and will get back to you as soon as I have an update.

Thank you.

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**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [July 21, 2026, 4:52pm UTC](https://community.retellai.com/t/voice-engine-glitch/3385/3 "2026-07-21T16:52:10Z")

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Hey @george1 These two settings can be contributing to the perceived agent garbled speech: lowering the voice temperature (currently at 1.14) & lowering the ambient sound (coffee shop) and test that.

If the issue persists after these changes, please share one-two further call ids + approximate timestamp where you clearly heard the glitch, we can take a deeper look.

Thank You

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<div class="post-metadata">

**Author:** ![george1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/george1/32/217_2.png) [@george1](https://community.retellai.com/u/george1)\
**Post date:** [July 21, 2026, 5:20pm UTC](https://community.retellai.com/t/voice-engine-glitch/3385/4 "2026-07-21T17:20:17Z")

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> [@george1](#):
>
> call\_3b66267e9c9bb61b7def4e447da

Okay that makes sense, but it’s definitely not “perceived” garbled speech, it IS garbled. Listen to the calls yourself.

call\_3b66267e9c9bb61b7def4e447da - 0:18 seconds  
call\_9f0f72d8c059a3b813ea0013452 - 0:03 seconds.

Sounds like a voice engine breakdown not interference with background sounds. Nonetheless, we will adjust and report back.

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<div class="post-metadata">

**Author:** ![mark1](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/mark1/32/2524_2.png) [@mark1](https://community.retellai.com/u/mark1)\
**Post date:** [July 21, 2026, 5:44pm UTC](https://community.retellai.com/t/voice-engine-glitch/3385/5 "2026-07-21T17:44:29Z")

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Hey @george1 Agent Chloe is on ElevenLabs’ `Flash v2.5` model, another useful next test you can try is a different TTS provider

Two good A/B candidates:

1. `retell-Cimo` — Different synthesis engine, similar female-American persona.
2. A Cartesia female-American voice — different vendor entirely; useful as a second data point

Run 5–10 test calls on the new voice covering the same scenarios. If the garbling disappears, that confirms it’s ElevenLabs-side variance on Hailey/Flash v2.5 for these calls. If it reproduces cross-provider, send us a fresh `call_id` + timestamp and we’ll dig into the media path.

Thanks