With TDM 2.06 mappers and players can use OpenAL EFX system, which is basically an open-source software replacement for systems like EAX, which, at the time, was available only for dedicated hardware by Creative. This allows us to set reverb definitions for rooms, and in my opinion, it's a game-changer for TDM FMs. If you ever played old Thief games with EAX-enabled hardware, you know what I mean. Otherwise, try playing Kingsal's Volta and the Stone with EFX On and Off to see the difference. It's a new life for game environments. The EAX reference page in the Wiki can be quite intimidating