Roland 303 I believe. It's an ancient bass-synth of some description.
Although I prefer the sound of a bass guitar, it has plenty to recommend it
including a rather lovely squidgy bassy sound that tingleth the spine. Used
on a multitude of tracks (can't remember any off-hand).
Yours sincerely (with peace and love),
Simon Brown
s.j.brown@ucl.ac.uk
UCL Geology (2nd year)