After much research, here is a step-by-step for getting your Vizio Soundbar to work with the Comcast remote using EFC codes (mine is the newer charcoal grey one, works great!)
Aux - Setup (2 blinks) - 11144 (2 blinks)
Aux - Setup (2 blinks) - 994 - Setup - 00169 - Vol Up - Should get 2 blinks
Aux - Setup (2 blinks) - 994 - Setup - 00168 - Vol Down - Should get 2 blinks
Aux - Setup (2 blinks) - 994 - Setup - 00037 - Mute - Should get 2 blinks
Aux - Setup (2 blinks) - 994 - Setup - 00165 - Power - Should get 2 blinks
Aux - Setup (2 blinks) - 994 - Setup - 00164 - Input - Should get 2 blinks
These are optional, I didn't use them:
Aux - Setup (2 blinks) - 994 - Setup - 00036 - <button to use for TVOL> - Should get 2 blinks
Aux - Setup (2 blinks) - 994 - Setup - 00101 - <button to use for TSHD> - Should get 2 blinks
Then set the volume control on the remote and other settings according to the Remote's manual.
ENJOY!! Hope this helps someone...
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