“Ross Robinson produced this album. Working with Slipknot was amazing. They’re such a high-energy metal band. Up to this point, it was probably the most metal thing I’d ever done.
“The first day of tracking, Ross and I went into the studio and saw that the drums were set up in this big drum room. Ross said, ‘No, that’s not going to work. I want the drums to sound nice and tight.’
"We tried a few different combinations of putting the drums into these gazebos and assembling baffles around them, but Ross wanted the band to be right there playing with Joey Jordison.
“We ended up moving the drums into this little hallway and the band kind of crammed their way in there all around Joey. We had the amps in an iso booth.
"It was amazing. Here we are in this giant studio, and this big, big band is packed into a hallway. We called it ‘the Sweat Box.’
“When you record a band like Slipknot, who play live in the studio and make such a huge sound, it’s like putting together a jigsaw puzzle.
"You can’t have too much bottom end because things will mush together. Matching the bass to the kick drum is pretty important – and Slipknot like a pretty clicky kick sound. The guitars can’t be too thin, ether, because they’ll get lost.
“Finding that right sonic point can be a challenge in cases like this, but the minute you find it, you’re there.”