First, I want tothank the group for the wonderful tutorials on GNU Radio 
My problem needs touse an external signal as the Audio Source. GNURadiodefaults 
to using the microphone in the laptop. I added an externalUSB/audio device to 
connect the external signal.
After unsuccessfullytrying several other ways to run GNUradio, I downloaded 
ubuntu-14.04.5-desktop-amd64-gnuradio- and am running it“live” off 
a USB stick. 
When the USB dongleis installed,`arecord -l` 
 ... card 1: Device[C-Media USB Audio Device], device 0: USB Audio [USB Audio] 
Subdevices: 1/1 Subdevice #0:subdevice #0
Also there is adevice /dev/hidraw1.
So the systemrecognizes the device when it is present.
The documentationfor Audio Source says:
 The specificaudio device to use can be specified as the device_name 
parameter.Typical choices are:  - pulse,hw:0,0, plughw:0,0, surround51, /dev/dsp

Well, I have triedevery variation of the above I and think of. No entry and 
“pulse”use the internal microphone. Everything else returns: 
I repeated theidentical results on a different computer running Debian testing 
(akasqueeze) and GRC 3.7.10
Google could not find any helpful information for this error message.
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