How to get that 'rotten sound' bass sound.

I had a chance of seeing them at the summerbreeze festival from the stage (gotta love doing livesound sometimes.. rest of the bands sucked that day though..)
Made some pictures of his settings back then, but hell that his live setup right? so the exact pedalsettings aren't realy gonna help you then ;)

Anyway it was a Boss DS-1 (tone down alot obviously) + a sansamp going to the p.a and the parallel out of the sansamp went to the amp. (svt4 or 2 into 8x10)

Tried the setup myself but didn't like it.. (allthough that was with a newer ds-1..)

Hope this helps hhehehe