Problem solved. I used the Sound GUI under the Settingsmenu to select the audio source. I am not sure if that is PulseAudio, but the selections and gain settings do work.
I even found that I could switch the device while the flowgraph was running. That said, I am puzzled about the intended usage of HW:1,0 and and similar device names.Suppose I create ~/.asoundrc following the instructions at: http://gnuradio.org/redmine/projects/gnuradio/wiki/ALSAPulseAudio Then should I be able to specify the device name in GRC and not have to rely on the audio setings? On 09/21/2016 12:40 PM,Cinaed Simson wrote: > > On 09/21/2016 09:40 AM, Paul Zander wrote: >> Cinaed, >> >> Your suggestion about testing the audio suggested an new experiment that >> may be a work-around. >> >> With Settings >> Sound >> Input >> Internal Microphone, my GRC with (QT >> GUI Time Sink) shows a signal that responds to the internal microphone. >> Speaking or clapping hands causes a response on the graph. >> >> When I change the Input to Microphone, USB Audio Device, and re-execute >> the flowgraph, the signal is very small and does not respond to >> sounds. Maybe Audio Source only works with the default input from the >> system. > > Use the PulseAudio Volume control to turn up the volume on the input > device. You can find the find the input device under Inputs.
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