Was thinking from OP's post elsewhere that Stuart Chalmers probably fits the bill st times. The comment about drones, chimes etc is right on as he definitely uses these things live but there are many works that seem based on simply letting 2 or more found/field recorded cassettes run in tandem. Much prefer this aspect of his work to when he messes about with delays and goes all psychedelic. Try the Imaginary Musics series (I think it's called that)