Raymond: thank you for your time and effort!

Following your advice I was able to configure iec958:CARD=U7 and point it at 
the correct hardware device.
The following aplay command goes to the digital output:

$ aplay -D iec958:CARD=U7 test.wav

However, the pulseaudio still redirects both, Analog and Digital (S/PDIF) 
outputs to the same analog output.
There are no special characters in the card name.
Here is an excerpt from /usr/share/alsa/cards/USB-Audio.conf:

USB-Audio.pcm.iec958_device {
        "Xonar U7" 1
...
}

The outputs of pactl list and aplay -L are attached.
So, what shall I do with pulseaudio to recognize the iec958 output?


** Attachment added: "aplay -L output"
   
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1498129/+attachment/4585449/+files/aplay-L.txt

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https://bugs.launchpad.net/bugs/1498129

Title:
  Asus Xonar U7 S/PDIF output not recognized by pulseaudio

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