Update microphone.py

microphone.py

@@ -30,7 +30,8 @@ class MicrophoneStream:
             # Run the audio stream asynchronously to fill the buffer object.
             # This is necessary so that the input device's buffer doesn't
             # overflow while the calling thread makes network requests, etc.
-            stream_callback=self._fill_buffer
+            stream_callback=self._fill_buffer,
+            input_device_index=0
         )
 
         self.closed = False