Here's a link to the Nobuchika remix; the bass enters 0:44. It's basically a squeaky, overdriven, 303-on-steroids type sound, the likes of which I've heard many times, but this one seems especially chewy. (If you've heard it all before and feel this is nothing special, you really should at least fast-forward to the break at 2:45, where a decaying "bounce" settles back into the bass sound -- it's a nice touch!)
I can get pretty close to this sound by sending a saw wave through a highly resonant filter followed by a waveshaper,* but if anyone has tips on how this sort of thing is done, I'd love to know!
*In fact, my best results so far are from the following:
saw --> highly resonant BPF --> waveshaper
same saw -> mildly resonant LPF
the two filters (BPF, LPF) mixed about 50/50
slow LFO modulating both filters
