I'm not sure how to describe it, but sometimes I want a nice warm tone from my bass and that's easy to get just adjusting the tone knobs down. However sometimes I want that grungy grindy sound. (Is there a proper word for it?) The one example I can find it in this song. (Link goes to the bass line I'm referring to) Ignore the video and all that jazz, but if you listen to the bass it has that sound I'm referring too. How do you achieve that?