@fisch3r
It sounds like you've encountered a situation where the interface behaves differently when selecting a voice by ID, especially if it's an ID from an external provider like 11labs. Generally, when the model section becomes greyed out, it could indicate that the selected voice ID is not compatible with the model options provided by the interface, or that manual entry of voice IDs has certain restrictions.
However, this doesn't necessarily mean that the model is not supported for the voice ID you've chosen. It could be a limitation of the interface or a specific requirement for manually added IDs. To get a definitive answer and ensure that you can use your preferred voice with Flash V2.5, I would recommend reaching out to the support team for more detailed information on this matter.
Would you like me to assist you with anything else regarding your voice assistant or any other queries?