The midi I got is from the original and from what I can tell it sounds just like it. http://rapidshare.com/files/25587041/Duke_Nukem_3D.rar
MP3 format: http://www.sendspace.com/file/ykv15y
The mp3 versions changed abit though. sound slightly different.
There was one time when I made them sound like this in Windows XP…
http://rapidshare.com/files/26255554/INVADER.ogg
I only have 1 recording unfortunately 🙁
Although recent version is 0.96 is recommend 0.70a as it sounds more ginuine to me.
http://www.thealmightyguru.com/VGMPF/Game.php?Id=DukeNukem3D-DOS