# RealtimeTranslationServerEventSessionOutputAudioDelta
## Properties
**event_id** | **String** | The unique ID of the server event. |
**r#type** | **String** | The event type, must be `session.output_audio.delta`. |
**delta** | **String** | Base64-encoded translated audio data. |
**sample_rate** | Option<**i32**> | Sample rate of the audio delta. | [optional]
**channels** | Option<**i32**> | Number of audio channels. | [optional]
**format** | Option<**String**> | Audio encoding for `delta`. | [optional]
**elapsed_ms** | Option<**i32**> | Timing metadata for stream alignment, derived from the translation frame when available. Treat `elapsed_ms` as alignment metadata, not a unique event identifier. | [optional]
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