Update app.py

app.py

@@ -15,8 +15,8 @@ async def text_to_speech(text, voice, rate, pitch):
         return None, "Please select a voice."
     
     voice_short_name = voice.split(" - ")[0]
-    rate_str = f"50%"
-    pitch_str = f"50Hz"
+    rate_str = f"{0:+d}%"
+    pitch_str = f"{0:+d}Hz"
     communicate = edge_tts.Communicate(text, voice_short_name, rate=rate_str, pitch=pitch_str)
     with tempfile.NamedTemporaryFile(delete=False, suffix=".mp3") as tmp_file:
         tmp_path = tmp_file.name