Urlo uses custom Matamp tube amps, and I've got to think that they're a big part of his tone. He's definitely using some kind of overdrive on top of that basic sound though.
I found an old, old interview with him here:
urlo
"What kind of amps, strings, any other gear do you use?
I got a Marshall JCM800 MKII amp and a Steelphone cabinet 400W. As I told You I'd like to change all for an HiWatt or an old Sunn. No particular problems for the strings, they only have to be really heavy! I use a 130-105-90-70 scale.
Then I've some distortions (an UFOCTAFUZZ, a so called **** - it was an old D'addario- and a boss analog overdrive), an Electro Harmonix SMALL STONE and a BASSBALLS, a Morley Wah and a Boss analog delay. That's all... for now.
On track #4-SNAKE the BASS really stands out, do you using any effects? Pedals etc.
Sure, the UFOCTAFUZZ and the small stone. Well, basically I always use a distortion:-)"
I doubt he's using that UFOCTAFUZZ anymore, but who knows. I couldn't find anything more current.
