Just a quick note on how to get EAX to work if the game keeps saying that it's not supported by your system.

Simply add the game in the Alchemy control panel. There could be some sparkling sound in the background when it comes to speech, but changing the duration in the Alchemy controlpanel should fix it. By duration, I mean the setting duration that can be found when you edit the entry for Dreamfall.
After doing this, you should now be able to enable EAX 3 or 4 in the game.

Hi what exact values have you used in "duration" for glitchles sound. Added the game to creative alchemy but Eax 3 and 4 work very wonky, sound glitching, sound drop in voice volume, effects not working properly. Win 8.1 by the way. Every other game with this method worked fine. Worst example is interogation scene at the begining, Super fast dialog and very glitchy.

I sadly don't remember what settings I had, I barely even remember creating this thread.
But it seems it might have been fixed with running the game with Residiul or ScummVM.

https://www.gog.com/forum/the_longest_journeydreamfall_series/the_longest_journey_use_residualvm_daily_to_play_without_most_bugs

Hi. Yeah the first game is best played through ResidualVM with guide from pcgamingwiki. Eax and 3d sounds are enabled by default, cause it's emulating an old legacy OS.

I was asking for Dreamfall. I figured it out eventualy. Turning on Vsync in in-game settings and configuring the alsoft.ini from the famous DSOAL mod for Fallout New Vegas is all it took to get EAX 4 working. However I do not know if it's working to it's full extent.

Using Creative Alchemy with Eax Unified is better for some games to restore and emulate 3d effects(EAX1,2,3,4), like KOTOR 1 and 2. For others using the aformentioned DSOAL - True 3D Sound for Headphones (HRTF mod) v1.4 from Nexus is what is needed. Restoring full spectrum of sound effects to old games is like breathing new life into them. Everyone should do it.

@ELFswe Okay, what values have you put in Dreamfall for Buffers and Duration to fix the audio? I tried values, 5/10(buffers/duration), 4/25 and arount those numbers. Did not fix the crackling and dialogue problems. Thanks in advance