I can't entirely remember, to be honest. I know there was fairly heavy compression likely involving Stillwell Rocket and Waves L1. The bass guitar itself had a really flubby, undefined sound that was just full of junk, so there was an absolute ton of EQ to shape it this way. I normally just start from scratch and let my ears guide me, so every new thing ends up different, according to what its perceived needs are. In this case it was an absolute ton of dynamic range compression, to the point where it almost sounded like a synth-bass, Bergstrand style, and after that it was a matter of carving it up into useful parts of the spectrum. Mostly trying to control ridiculously flubby sub-lows and undefined low-mids, and midbass. Lots and lots of EQ.
Sorry I can't get more specific, but aside from the standard fare stuff like using SVX, and the PSA-1, along with lowpassing the low-end track and highpassing the grit track, there is nothing that would be universally applicable to all bass guitars. A lot of the processing was very specific to this particular raw tone.