I am a big Tool fan, probably the one band that got me into guitar, along with a lot of nu-metal and black metal when I was 16/17.
I'm pretty sure Undertow is 100% Marshall. He didn't get the Boogie stuff until Aenima.
I think Opiate was all Marshall. Old photos of live performances during Undertow clearly show a Dual Rec on stage next to the Marshall. You can also watch the studio footage of Undertow on youtube and you'll see him plugged into a Dual Rec. It's hard to say if used them on the record or not but he definitely started blending them when touring for the album.
All Marshall right here... love that tone. If i was a betting man I would put $5 on there being a tubescreamer running into it. EDIT: I take that back, watching his Rig Rundown now lead me to believe it was an old MXR Micro Amp
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