async def append_to_audio_context(self, context_id: str, frame: TTSAudioRawFrame):
        """Append audio to an existing context."""
        if self.audio_context_available(context_id):
            logger.trace(f"{self} appending audio {frame} to audio context {context_id}")
            await self._contexts[context_id].put(frame)
        else:
            logger.warning(f"{self} unable to append audio to context {context_id}")
Append audio to an existing context.
src/pipecat/services/tts_service.py