I am completely effects-illiterate. I have no idea what an "evelope filter" is. But I love watching Doug go!
What does he use live for the chorus of Bless those (Annie's song).
It's just super-deep, super-heavy bass - impossible to hear on the album or youtube, but if you've seen them live, you know it sucks the breath out of you.
http://www.youtube.com/watch?v=b_8BYGfvKjE (1:32-1:50)
And the obvious second question: Why doesn't he play it wide-open all the time?
~Jimm