I've got #CubicSDR running, outputting to the Mac Mini (linux) headphone jack.
Then I've got pavucontrol running a Monitor of Stereo Output, & set the Recording Input to be that same Monitor.
Then #QSSTV is listening to the PulseAudio Sound Server.
Shown, it's on the APRS 2m frequency, just so I can SEE some signal making it all the way through.

