I'm into act 2, and in the lengthy mix of cutscenes/action at the start, my sound invariably cuts out - I can hear footsteps, but no voices or other sounds. I've checked the "common issues" list and tried both stereo and 5.1 sound, but neither of these work.

I have Creative X-Fi card running on Windows 7 64-bit, with latest drivers.

P.

Same thing happened to me. Downloading English language pack (almost 1 GB!), hoping reinstalling that will restore voices. Very frustrating. Brilliant and difficult game up to this point, but this kind of technical glitch is maddening.

http://www.gog.com/en/forum/the_witcher_2/the_characters_voices_have_been_muted_but_the_sound_effects_still_play/?search=voice

seems of the same origin. I'm using an x-fi card and win7 64 as well. And just checked again: Only some ambient noises remain, voices are fully disabled. Funny thing is I can sort this thing out by loading an earlier savegame. Althoug the dissappearing of those sounds can happen midst the game then.

Happen to me few times...
This is why I save the game before the end of the chapter,
Then restart the game and move onto the next chapter.
That always fixed it for me...

Mind you I am using Wind 7x64 and HD Sound (non soundblaster).

I think you should ask for support at tw2support@thewitcher.com

BTW, do you have surround in TW2? I mean, when you turn around do sounds move to rear speakers? I also have an X-Fi Gamer but all the sounds come only from the front and central speakers.

If you ask CDP for support send them the dxdiag report file, they will ask for it anyway.

when it does't dissapear all of a sudden I have surround sound in TW2. ;)

I'm using an Audigy 2 Value card with 5.1 Dolby Digital Live and I have a similar problem, although not quite as bad.

Randomly the music and background ambience will disappear while the dialogue, footsteps and other sound effects remain. The atmosphere within this game is really amazing, but without the ambient sounds it loses that feeling of immersion.

Reloading a save game only works some of the time for me, then it's not long before it happens again. I REALLY hope the 1.3 patch fixes this, although I would rather not wait that long :(

Has anyone found a fix?

http://www.gog.com/en/forum/the_witcher_2/voices_have_disappeared

Here's another topic of sound issues. Maybe all problems have the same root.
Further testing needed.

I seemed to have solved my issue of ambient sounds/music dropping out, although I'm not sure about the dialogue disappearing issue which occurs after Loredo's House mission.

Try turning the Texture Memory Size down a notch (I went from Large to Medium), I think my sound was dropping out becuase I was running out of memory. This can also fix crashes and make the game run a little better.

PS. I have a 1gb video card and 4gb ram - having more memory means you should be able to turn this setting up higher than medium, having less means you should maybe go down to small