In gamemastering oblivions edge I thought it would help out the atmosphere to have a soundtrack as alien as the enemy itself. I think something using weird instruments like the music used for the Zergs in starcraf would fit. Any suggestions?

At the moment im using the excellent Mutant soundmixer from http://www.stefanisberg.com/mutant/index.html .

I could use some more organic sounds though. Is it possible to extract sounds from starcraft 2? Or is there anywhere else I can find cool soundeffects?

Well, the most obvious source would of course be the Tyranid sounds from Dawn of War 2. You would need the game (obviously) and an SGA reader to extract them, though. I was unable to find the Nid sounds on Youtube only their theme songs from the soundtrack.

Thanks, i'l look into that. I found another good soundmixer at http://softrope.net/ . Its possible to randomize sounds played or make them play in sequence. If youre gonna use softrope I recommend downloading mutant soundmixer for the sounds first since softrope includes no sounds in itself.

Also found some fitting music at Kevinmacleods site. http://incompetech.com/m/c/royalty-free/index.html?keywords=041&Search=Search

You could also download the Dawn of War 2 soundtrack for free here:

http://news.bigdownload.com/2009/04/29/download-dawn-of-war-2-official-soundtrack/

I think what mattered to him was the sounds of Tyranids and not the Tyranid theme music.