Update app.py

app.py

@@ -17,8 +17,8 @@ import edge_tts
 MAX_MEMORY     = 20
 MAX_NEW_TOKENS = int(os.environ.get("MAX_NEW_TOKENS", "300"))
 TTS_VOICE      = "zh-CN-XiaoyiNeural"
-TTS_RATE       = int(os.environ.get("TTS_RATE",  "7"))
-TTS_PITCH      = int(os.environ.get("TTS_PITCH", "13"))
+TTS_RATE       = int(os.environ.get("TTS_RATE",  "-2"))
+TTS_PITCH      = int(os.environ.get("TTS_PITCH", "8"))
 IMG_DIR        = Path(__file__).parent / "img"
 MODEL_ID       = "LiquidAI/LFM2.5-1.2B-Instruct"