Fix unspecified audio device
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		@@ -59,6 +59,8 @@ class Boardie:
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        self.device.grab()
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					        self.device.grab()
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        self.pa = pyaudio.PyAudio()
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					        self.pa = pyaudio.PyAudio()
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					        if audio_device is None:
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					            audio_device = self.pa.get_default_output_device_info()['index']
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        dev_info = self.pa.get_device_info_by_index(audio_device)
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					        dev_info = self.pa.get_device_info_by_index(audio_device)
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        self.sample_rate = int(dev_info['defaultSampleRate'])
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					        self.sample_rate = int(dev_info['defaultSampleRate'])
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        self.stream = self.pa.open(
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					        self.stream = self.pa.open(
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