I remember it was an amalgamation of all kinds of percussion as well as a regular drum kit. It was recoded piecemeal which perhaps explains why the pattens sound less commonplace. The main rhythm pattern from part 1 and into part 2 was played with fingers on a large drum, extremely close mic’d. In part 2 the high end sounds are wire brushes on metal objects, (probably chinese cymbals stacked on the floor) and that’s a regular snare drum that has the snare (snap) off. Part 3 incorporates log drums and cymbals. I don’t have a particular memory from recording those tracks except that I spent a lot of time exploring ideas on my knees!