From Discogs.com : "David Jackman is the man behind the sounds. He has been working in the field of musical experimentation and improvisation for over 25 years. His early work, documented in scores as well as performances with Scratch Orchestra, offers only a glimpse of the drone-based dynamics that would appear later. While his last 15 years have been dedicated to the music of Organum, Jackman's future plans include more work on independent solo projects."
Track 1 is the complete B side of the "In Extremis" LP (L.A.Y.L.A.H. Antirecords, 1985).
Track 2 is an alternate version of the original that appeared on the "Horii" 12" (L.A.Y.L.A.H. Antirecords, 1986).
Track 3 is a previously unreleased track (1989).
"Volume Two" was released by Robot Records in 2000.
Get it here : Organum - Volume Two