I have no idea what effect he uses I guess it's a flanger.
I got this out of bass player magazine so I am 100% correct its hard to type the rhythm cuz they use straight lines not dashes in there tabs but I did the best I could





                 b                                                      d                   e
g-----------------------------------------------------6-------6----6/8-------8
d-----------8------8----8-8-----8---8-------8-------------------------------
a-------------------------------------------------------------------------------
e-------------------------------------------------------------------------------