Applying any type of Dolby decoding is a waste of time as we do not encode sound at all. Therefore enabling Dolby does nothing but waste more processing cycles checking for a Dolby signature in the sound, when the game plays it.
EAX actually interferes with the 3D positioning of the sounds in the game due ot how it alters the audio.
Aces High uses true 3D positioning, with no encoding. All you have to do is set your speaker configuration, in Windows, and the sounds will play from the correct spot, at the correct levels.