Click on device of sub setting Audio output … look for the sound device that is the device you want … or set to default.
if trying default … open another terminal and type/return
pavucontrol
its probably not installed so
sudo apt-get install pavucontrol
yes to all needed
did you trying clicking on hte power button?
its in the same place as the play button in my pics —
power button is older version of gqrx
play button is from recent build of gqrx from git