Add more 55-series examples

Also:
- remove unnecessary pass-through `_update_settings` implementation in `FalSTTService`
- warn that `AsyncAITTSService` doesn't currently support runtime settings updates
- update how `GradiumTTSService._update_settings` checks for voice changes
- remove a couple of unnecessary args (because they specified defaults) in other examples

src/pipecat/services/asyncai/tts.py

@@ -179,6 +179,20 @@ class AsyncAITTSService(AudioContextTTSService):
         self._keepalive_task = None
         self._context_id = None
 
+    async def _update_settings(self, update: TTSSettings) -> dict[str, Any]:
+        """Apply a settings update.
+
+        Settings are stored but not applied to the active connection.
+        """
+        changed = await super()._update_settings(update)
+
+        if not changed:
+            return changed
+
+        self._warn_unhandled_updated_settings(changed)
+
+        return changed
+
     def can_generate_metrics(self) -> bool:
         """Check if this service can generate processing metrics.
 

src/pipecat/services/fal/stt.py

@@ -251,11 +251,6 @@ class FalSTTService(SegmentedSTTService):
         """
         return language_to_fal_language(language)
 
-    async def _update_settings(self, update: STTSettings) -> dict[str, Any]:
-        """Apply a settings update."""
-        changed = await super()._update_settings(update)
-        return changed
-
     @traced_stt
     async def _handle_transcription(
         self, transcript: str, is_final: bool, language: Optional[str] = None

src/pipecat/services/gradium/tts.py

@@ -128,9 +128,8 @@ class GradiumTTSService(InterruptibleWordTTSService):
         Returns:
             Dict mapping changed field names to their previous values.
         """
-        prev_voice = self._voice_id
         changed = await super()._update_settings(update)
-        if self._voice_id != prev_voice:
+        if "voice" in changed:
             await self._disconnect()
             await self._connect()
         else: