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CAN YOU TELL ME MORE ABOUT THE `generate_reply`: Generate dynamic responses from LLMs FEATURE OF THE Livekit API?

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The `generate_reply` method is a feature of the LiveKit API's `MultimodalAgent` class that allows you to manually generate speech responses. When using a `MultimodalAgent` with a `RealtimeModel`, you can call this method to create a new response:
```agent.generate_reply(on_duplicate="cancel_existing")```
The method includes an `on_duplicate` parameter that can be set to "cancel_existing", which cancels any existing response generation before starting a new one.
 Sources: <https://docs.livekit.io/agents/openai/customize/turn-detection/|Turn detection | LiveKit Docs>