Good question.
technically speaking it supports everything that EAX v1 supports.
I'm not to sure how adaptive EAX is as there in no channel selection involved, unlike Galaxy and FMOD.
It just adapts to whatever your card is set to as far as I can tell.

You lucky people. Just the thing to go with shiny new visuals is shiny new sound. After successfully testing new audio renderers for Unreal and UT for some time, Smirftsch at OldUnreal has also decided to build the new OpenAL audio renderers for Deus Ex :D They sound amazing, but they are not finish...