"Knife Missile's Return" [4.8 MB .mp3]
An earlier-recorded beat (from a Richard Devine preset) loops in the ADDAC wav player module. The ADDAC's envelope follower uses the loop's rising and falling gain to trigger a filter-and-volume contour for another oscillator (to make the droning sound in the first half).
I had to manually set a Cubase tempo to match the ADDAC loop (93.5 bpm). Then I could add the melody parts (also modular-made, with some reverb and delay) and some additional percussion.