Update main.py

main.py

@@ -10,6 +10,8 @@ def generate_tone(note, octave, duration):
     duration = int(duration)
     audio = np.linspace(0, duration, duration * sr)
     audio = (20000 * np.sin(audio * (2 * np.pi * frequency))).astype(np.int16)
+    return sr, audio
+
 
     demo = gr.Interface(
     generate_tone,