The bass is a constant flowing A# with flanger.  Drums are obvious.


For the echoed chords (If your playing on a keyboard, turn split voice on with 
left half bass guitar, right half harmonized on echo to play the following chords:
F A# F,   D# G# D#...
F A# F, D# G# D#,

A# D# A#
C F CCmain
C# F# C# out

Don't forget to prerecord the drums to play too, and have fun earing out that last part.