Thanks for your interest! As far as I can remember, Grammostola doesn’t have any field recordings at all. Pretty much all the sounds came from thriftshop choral vinyl, which I put through a lot of granulation and stuff. I adore choral music and use it pretty much all the time in one way or another. For melodies, I mainly used Robert Henke’s Granulator II plugin for max4live.
But it dawned on me after a while that I seemed to be trying to make music that resembled field recordings a bit - lots of textures always moving and never repeating, but at the same time keeping more or less the same ‘ambient’ structure. ‘Suvanto’ (‘stream pool’ in Finnish) was a very deliberate attempt to make a kind of swampy environment.
I’ve been doing the same thing ever since, and more recently like to mix actual field recordings in with “synthesised” field recordings and generally make interestingly-textured (for me) soundscapes.