For this one I used my TR-808 and TR-606 drum machines, Big Briar Etherwave theremin, and Casio SK-1.
I used a Sony IC Digital Recorder to capture some trains in Germany, an elevator in Winter Park, Colorado, and some household sounds, including a malfunctioning toilet that sounded just like the Heuristics trumpet loop to me.
There is also some choppy audio with intermittent static from some public-domain porn posted on the internet.
