Thanks. Can you edit /usr/share/alsa/cards/USB-Audio.conf, scroll down
to the "USB-Audio.pcm.iec958_device" section and add the following line:

        "Sennheiser USB headset" 999

(including quotes)

...just above the similar "Logitech USB Headset" 999 line. Notice that
your headset is spelled with a lowercase h.

Save the file and reboot to test. If you can confirm this resolves your
problem, I will be able to submit the attached patch, that makes this
the default for Ubuntu and upstream ALSA in the future.


** Patch added: 
"0001-alsa-lib-conf-block-S-PDIF-access-for-Sennheiser-USB.patch"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/975941/+attachment/3058883/+files/0001-alsa-lib-conf-block-S-PDIF-access-for-Sennheiser-USB.patch

** Changed in: alsa-lib (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/975941

Title:
  [soundnua]: Spurious "Digital Output S/PDIF" output entry for USB
  headset

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