Ah! Raymond's suggestion to:

edit /etc/modprobe.d/alsa- base.conf and add the following line
options snd-hda-intel model=3stack

has restored my sound, excellent! 
thank you!

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https://bugs.launchpad.net/bugs/1106334

Title:
  [Gateway E4300] alc880 - no sound after 12.10 upgrade, only "dummy
  output" appears

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