I have finally managed to get this working as follows:

1. /etc/modprobe.d/alsa-base.conf
  a) comment out all references to # options snd-usb-audio index=-2
  b) add lines at end of file
       # Force Sennheiser PC 8
       alias snd-card-3 snd-usb-audio
       options snd-usb-audio index=3 vid=0x1395 pid=0x0025

2. Test by manually loading module `sudo modprobe snd-usb-audio` and
confirm 'aplayl -l' shows card and you can select and test it in sound
settings.

3. Organise to always load this module on boot by adding following line to 
/etc/modules
    snd-usb-audio

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https://bugs.launchpad.net/bugs/1266343

Title:
  Sennheiser USB headset not listed as device in aplay -l

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