Is anyone else getting VERY low volume levels when starting The Witcher 3? The sword clip and opening cinematic both have volume levels so low I can't hear them, although actual game volume is plenty loud enough.

Not a game breaker, just...annoying.

This could be interesting for you:

Q.: The audio level is very low or missing when the game starts, during dialogs and cutscenes.

A.: The only solution (https://www.gog.com/forum/the_witcher_3_wild_hunt/only_stereo_and_very_low_volume/post6) up to date is to change your configuration to either Stereo (2.0) or Quadraphonic (4.0) until the game is fixed. (Cheers Red_Eagle_LXIX)

http://www.gog.com/forum/the_witcher_3_wild_hunt/faq

Yes,it's annoying when games do that.

It already is. Has been from the beginning.

How do you do that fix? I'm pretty sure my setup is set to stereo and The Witcher has been nothing but problems exactly like this with the mix and audio levels...

See if you can change the setup in your sound driver settings. For example my sound software is named "HD VDeck".