Double LP released on their own Agaric Records in 1985. I don't think that this was re-released in any format.
They are legends so would assume they are known to you. If not, for the sake of brevity, I've lifted this from Discogs: "Borbetomagus is a trio of Don Dietrich (reeds) Jim Sauter (reeds) and Donald Miller (guitar) and additionally Brian Doherty (electronics) that has existed since the mid-seventies. This is free-improv "jazz" of the most extreme nature and its not for the faint hearted, since Borbetomagus create a heavy bone crushing wall of noise."
The trio is the core but they have also included in their time (a very young) Adam Nodelman of Sunburned Hand Of The Man.
http://bleakbliss.blogspot.co.uk/201...us-zurich.html