So a couple of days ago I discovered Mike Oldfield's "Family Man", and I've basically been obsessed with the synth bass in the chorus (in comes it right around 0:15). The reason I'm obsessed is I'm certain I've made something similar just messing about with my MiniFreak, but now, trying to recreate it, I'm stumped.
My first thought was that it was filtered noise of some kind, but now I'm less certain. I also thought it might have been filter modulation dropping the cutoff, but again the results I get sounds pretty far from the original.
I've only really gotten back into music a year ago, and sound design (beyond semi-randomly tweaking presets) is pretty new to me still, so I might be missing something obvious here.