Dream Theatre - Dance Of Eternity Live

[Nickthebassist]

What is that thing when the drums eneter? It sounds like a steam roller. If that's a bass, what kind of effect is it? I'm not keen on the rest of it, I just like the tone. And no, I'm not gonna steal it, if I used it in my band they'd kill me.

[Mark Latimour]

Its just John Myung playing on the Low B string. The timing of the kick drum and possibly some light delay on the Low B causes the sound. Theres no magic to it.