When they recorded with the Haunted, they took the distrotion signal from the preamp of an 5150 and then connected it to an other 5150 preamp but on a clean chanel.
Then out to two 4x12 with microphones on both of them.
Fredrik use to do 4 chanel of every guitar. two in left, two in right with diffrent sound.
The only thing he use to do with the signal is to use an Urei LA22 with ratio 6:1 working only below 150 to 200 hz. Short release and attack.
In the mix he use to add bass, deduce a litte bit at 300 hz, boost at 1,5 kHz with realy big Q.value.
Then boost again at 4 khz.
He use to add just 2:1 full band compression.
/Best regards Thomas