Audio Source audio_source from gnuradio import audio audio.source($samp_rate, $device_name, $ok_to_block) Sample Rate samp_rate 32000 int 16KHz 16000 22.05KHz 22050 24KHz 24000 32KHz 32000 44.1KHz 44100 48KHz 48000 Device Name device_name string #if $device_name() then 'none' else 'part'# OK to Block ok_to_block True enum part Yes True No False Num Outputs num_outputs 1 int 0 < $num_outputs out float $num_outputs Not all sampling rates will be supported by your hardware. Leave the device name blank to choose deafult audio device. \ ALSA users with audio trouble may try setting the device name to plughw:0,0 The audio source can have multiple outputs depending upon your hardware. \ For example, set the outputs to 2 for stereo audio.