Update app.py

app.py

@@ -103,7 +103,7 @@ def text_to_speech(text):
         try:
             temp_filename = f"temp_tts_chunk_{i}_{int(time.time())}.wav"
             options = SpeakOptions(
-                model="aura-2-phoebe-en", encoding="linear16", container="wav"
+                model="aura-2-theia-en", encoding="linear16", container="wav"
             )
             deepgram.speak.rest.v("1").save(temp_filename, {"text": chunk}, options)