Add initialization of self._settings to service superclasses (STTService, TTSService, LLMService), using "generic" settings for those services (STTSettings, TTSSettings, LLMSettings)

src/pipecat/services/llm_service.py

@@ -205,6 +205,7 @@ class LLMService(UserTurnCompletionLLMServiceMixin, AIService):
         self._tracing_enabled: bool = False
         self._skip_tts: Optional[bool] = None
         self._summary_task: Optional[asyncio.Task] = None
+        self._settings = LLMSettings()  # Here in case subclass doesn't implement more specific settings (hopefully shouldn't happen)
 
         self._register_event_handler("on_function_calls_started")
         self._register_event_handler("on_completion_timeout")

src/pipecat/services/stt_service.py

@@ -105,6 +105,7 @@ class STTService(AIService):
         self._audio_passthrough = audio_passthrough
         self._init_sample_rate = sample_rate
         self._sample_rate = 0
+        self._settings = STTSettings()  # Here in case subclass doesn't implement more specific settings (hopefully shouldn't happen)
         self._tracing_enabled: bool = False
         self._muted: bool = False
         self._user_id: str = ""

src/pipecat/services/tts_service.py

@@ -192,6 +192,7 @@ class TTSService(AIService):
         self._init_sample_rate = sample_rate
         self._sample_rate = 0
         self._voice_id: str = ""
+        self._settings = TTSSettings()  # Here in case subclass doesn't implement more specific settings (hopefully shouldn't happen)
         self._text_aggregator: BaseTextAggregator = text_aggregator or SimpleTextAggregator()
         if text_aggregator:
             import warnings