TTSService: Remove newlines before sending text to TTS service to generate

CHANGELOG.md

@@ -32,6 +32,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- The base `TTSService` class now strips leading newlines before sending text
+  to the TTS provider. This change is to solve issues where some TTS providers,
+  like Azure, would not output text due to newlines.
+
 - `GrokLLMSService` now uses `grok-2` as the default model.
 
 - `AnthropicLLMService` now uses `claude-3-7-sonnet-20250219` as the default

src/pipecat/services/ai_services.py

@@ -399,6 +399,9 @@ class TTSService(AIService):
             await self._push_tts_frames(text)
 
     async def _push_tts_frames(self, text: str):
+        # Remove leading newlines only
+        text = text.lstrip("\n")
+
         # Don't send only whitespace. This causes problems for some TTS models. But also don't
         # strip all whitespace, as whitespace can influence prosody.
         if not text.strip():