Indeed, when we were looking for a solution to the sound sync problem we we developed one similar to deviantopian's app. It will start running when you launch the game from the shortcut or launcher, but not if you run BGE.exe. Moreover it will be active only while Beyond Good and Evil is active, so there should be no unnecessary stress for your processor.
The funny thing is, most of the people in this thread, who state that the sound sync is shot, never actually bought the game at GOG.com in the first place... C'mon guys, it's no problem if you bought the game elsewhere, but at least state that it isn't our version you're having problems with or you're making us look bad. :)
As for the actual problems with our release, please contact us via the Support section if you're experiencing sound sync issues (as in dialogue being played a second or more after it should, not the lack of voice sync, which BG&E never really had;)). Some of you already did (you know who you are;)) and we're grateful. :) When you write your message, check and let us know if you see run.exe in the Task Manager when you start BG&E from the shortcut. We'll do our best to polish our built-in fix.