In case you cannot see anything related to HDMI or your desired audio device in pavucontrol just restart pulseaudio with pulseaudio -k ( -k kills the previous instance before restarting) and do the above steps again. The default might also work after the pulseaudio configuration you just made. In SDRangel's Preferences/Audio menu make sure something like alsa_output.pci-0000_00_1b.0.hdmi-stereo is selected.Then in the 'Output devices' tab the HDMI / display port is selected as it is normally the only one.Select HDMI from the profiles list in the 'Configuration' tab.Open pavucontrol and open the last tab (rightmost) called 'Configuration'.So in any case make sure nothing is muted there. On the Udoo x86 the HDMI output depends on the S/PDIF control and it occasionally gets muted when the HDMI monitor is turned off or goes to sleep. Check the audio config with alsamixer.
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