It’s hard to tell from just an mp3, and I don’t know if there is a specific or unique synthesis algorithm solely responsible for the texture and colour; that said, I think you’re right that there are resonant filters creating that upper mid-range wash, and it also sounds like a very wet, layered reverb. I think identifying the ‘untreated’ core sample or pure-tone might be tricky, the treatment less so. Comb-filtering and AM synthesis are good starting points for the pseudo-choral/vocal colour that I can hear.
ps if there was an award for ‘generating the most varied responses’, this query would definitely be in the running
you all take yourselves too seriously… it’s really just an orchestra tuning up and put through a really crappy tape machine, either that or the goddess venus let out a long queef(are we allowed to say things like ‘queef’ here?)
nice sound, though, quite "effluvial"! (oh snapz, i know the right term!)
reminds me of Bill Laswell’s ambient stuff.