Create app.pyx

app.pyx

@@ -0,0 +1,8 @@
+from fastrtc import Stream, ReplyOnPause
+from numpy import np
+
+def echo(audio: tuple[int, np.ndarray]) -> tuple[int, np.ndarray]:
+    yield audio
+
+stream = Stream(ReplyOnPause(echo), modality="audio", mode="send-receive")
+stream.ui.launch()