default output device to 0

tools/fourier/cli.py

@@ -178,6 +178,7 @@ def main():
 
             audio = pyaudio.PyAudio()
             stream = audio.open(format=pyaudio.paInt16,
+                                output_device_index=0,
                                 channels=1,
                                 rate=44100,
                                 output=True)