Thanks for your mail. I try to describe the sound in details. It `s a sound ,Rick Wakeman used in his song `Evening`.(1991) Maybe it is taken from Emu Library. I looped it and added the looped sound. I copied this Stereo Track and pitched it down at lower octave. I copied all the tracks and did High Pass Filtering ( 1000 hz at 24 db) and put the track volume on 5 db. I mixed down all the tracks and cut them at 5,863 seconds. That`s it.