That's from some interview I read a while back..
GW: What gear and settings do you guys use to get your tone?
Steer: Just for simplicity, I only use one amp live--a Peavy 5150 with a Marshall Guv'nor pedal in front of it to beef up the overdrive just that little bit extra. In the studio, though, it's a different matter; I use several different amps--a selection of Marshalls and the 5150.
Hickey: One of the amps Bill used on Heartwork was a Marshall 30th Anniversary head that's really fierce, and he also used a tiny Marshall stack on pretty much every track to add some extra high end.
[Note: Mike didn't join Carcass until after the Heartwork album was recorded.]
Steer: Yeah, if I remember correctly, almost all of the guitar tracks were done with at least two amps going at once--one of them being a large amp, like the Anniversary [on channel two], a Marshall SL-X 100 watt or the 5150, and then also more often than not, my 10-watt [Marshall] Valvestate micro-stack for extra texture.
Unlike a lot of other bands who do the kind of stuff that we do, we tend to use a lot of mids. I don't think some people realize how important middle is to a guitar sound.
Hickey: Absolutely, mids are essential in a solo--without 'em your tone is real thin. My current backline setup is a Marshall SL-X 100-watt head and a Peavey 5150. I suck the mids out of the Marshall but not out the Peavey. I started the Heartwork world tour using a Guv'nor pedal too, but I just got tired of stage divers stepping on my shit!
That mentions Heartwork though, so it doesn't answer your question.