Jaytech Overdrive Proff remix bass

http://proffmusic.com/2011/12/20/proff-music-podcast-011/ @ 28:00 ish is a good place to hear it

Besides having great synergy with the kick I’m curious what goes into a bassline like this. Is it just a single patch? I seem to have absolutely terrible luck with layering basslines when the patterns are the same.

The filter envelope seems pretty straightforward to me, medium - short decay I think? Sounds like there is a pulse oscillator in there. It almost sounds kind of FM-y to me (basically any bassline that mystifies me I seem to write off as FM now… really should get into doing some FM stuff).

Any insight would be great, thanks.