----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Introduction]() * [Orchestration Models]() * [Orchestration Models]() * [Glossary]() -----------------------------

### Answer It sounds like you're experiencing issues with overlapping or garbled speech outputs when using Vapi with GPT-4. This might be related to the orchestration models handling the turns and timing of speech outputs. Ensuring smooth, natural interaction, especially with handling the flow of conversation, is crucial in voice AI systems [(1)]() . A potential first step could be to verify and adjust the endpointing settings in your Vapi configuration, as incorrect endpointing might cause the assistant to start speaking before the user has finished, leading to overlapped or jumbled outputs [(2)]() . Additionally, consider reviewing the setup for interruptions (barge-in) settings to ensure the system accurately detects when to halt the assistant's responses during an ongoing user interruption. If the problem persists, it may be beneficial to examine the logs for any errors or unusual behaviors in the speech synthesis process and contact Vapi support for a more in-depth analysis and tailored assistance.