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I am using Win7 x64.
I have Polish retail disc version of the Witcher EE installed and I can enable or disable EAX in game menu.

However, when i installed and run GoG version, I noticed that the EAX checkbox is greyed out. Any ideas on how to fix it? Creative Alchemy?
This question / problem has been solved by aialissaimage
No game in Windows 7 can use EAX without the installation of Alchemy, even if the game reports it can use it, EAX cannot work without it. So yes; in short - install Alchemy for every game you intend to use EAX with.

The reason behind this is the exclusion of DirectSound and DirectSound3D from Windows 7. Alchemy is needed to "emulate" the DirectSound through OpenAL to achieve a similar result.
Post edited May 11, 2011 by aialissa
Also note that I have found little benefit to EAX in the game. Although it's supposed to add environmental effects, I have heard absolutely no difference running the game with Alchemy/EAX enabled, and in fact effects like reverb that are normally there with the software environmental effects turned on are gone using EAX. The only benefit I've heard of is that you'll need to use Alchemy/EAX for surround sound. In short, you aren't missing much.
Post edited May 11, 2011 by sear
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sear: The only benefit I've heard of is that you'll need to use Alchemy/EAX for surround sound. In short, you aren't missing much.
I'm not even sure this is accurate to be honest. I use a dolby digital decoder mixamp and a set of headphones (Astro A40's) and I'm fairly sure I get the surround sound effects as sometimes voices etc still come from people stood behind me. It could be because I have AC3 Filter forcing all outgoing signals to be 5.1 though as I have one of these stupid realtek chips that, despite being designed for Windows 7, seems unable to output in anything more than stereo.
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serpantino: I'm not even sure this is accurate to be honest. I use a dolby digital decoder mixamp and a set of headphones (Astro A40's) and I'm fairly sure I get the surround sound effects as sometimes voices etc still come from people stood behind me. It could be because I have AC3 Filter forcing all outgoing signals to be 5.1 though as I have one of these stupid realtek chips that, despite being designed for Windows 7, seems unable to output in anything more than stereo.
I think the game has some sort of 3D processing going on in stereo mode because I am able to place sound behind me. Not as good as EAX can be with CMSS-3D turned on (see Unreal Tournament 3 for basically 100% perfect positional audio), but there's definitely something there. Still, I'm just going based off of forum posts I've read, so it's possible that you don't need EAX/Alchemy for surround. It could also be an operating system thing. Who knows? Unfortunately CD Projekt have never been that talkative about some of the game's bugs.
I have alchemy installed with a Creative Audigy board on a Vista-64 machine. Interestingly enough Alchemy detected "The Witcher" automatically; the only game I ever recall being detected. Usually I have to set it myself.
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sear: I think the game has some sort of 3D processing going on in stereo mode because I am able to place sound behind me.
This is something I have noticed is pretty standard for the current generation of console games. With a pair of stereo headphones sound that come from behind the camera sound like they are coming from behind you. Its pretty sweet. I cant really comment on PC games. I just installed a new Radeon HD 6950 a couple of days ago. Before that I wasn't able to play any recent-ish games, so im not sure how common it is.
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sear: I think the game has some sort of 3D processing going on in stereo mode because I am able to place sound behind me.
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MobiusArcher: This is something I have noticed is pretty standard for the current generation of console games. With a pair of stereo headphones sound that come from behind the camera sound like they are coming from behind you. Its pretty sweet. I cant really comment on PC games. I just installed a new Radeon HD 6950 a couple of days ago. Before that I wasn't able to play any recent-ish games, so im not sure how common it is.
I think most console games have this because it's a standard feature of the XAudio toolset, which is used for many PC games these days in addition to Xbox 360 games. FMOD might also have something similar, which again is quite common, and Miles too, which The Witcher uses. The one downside I'd say is that the effect isn't nearly as effective as it "could" be in these games, and most games don't offer a proper headphone mode for true HRTF positioning, but rather offering some very weak positional processing that operates in 2.1 mode. It's definitely a step up from older games where everything sounded like it was "in your head" with poor spatial imaging, but again, I've never heard anything that sounds as good as native OpenAL games like Unreal Tournament 3 with CMSS-3D turned on.