Im sorry guys but this is so easy. Get any half decent tube amp with a good amount of pre-amp gain, a Marshall DSL or better will do fine. Get a sound that isn't too bass heavy or Mid scooped, maybe Bass 6, Mid 5 and Treble 6 with about just over half of full gain. then get an EH Big Muff or similar pedal, (i personally use a DOD American metal) and plug it directly into the amp. Then turn the Pedal and the amp overdrive on and tweak up the pedal, the settings i use on my pedal are Level 9 O'clock, Presence between 12 and 3 O'clock and Distortionat about 10 or 11 O'clock, However it could be different on other pedals.
This will give u a seriously overloaded pre-amp signal going to the power amp and sounds exactly like any song from the first Korn album, and is easily tailored by varying the settings on either amp or pedal. I must say though, that this sound lacks any kind of tonal clarity what so ever and is really only suited to flog music that rely's mostly making alot of low tuned noise.
As for Limp bizkit, if your after his over drive sound then i always thought it was a straight forward high gain moderatley scooped tube sound, he did use Recto's after all. If however you'r trying to get his effected sounds, then be prepared to go and spend loads of money on obscure pedals and hours of tweaking. He used to use Roland JC120 amps for his clean sound as well, so that would be a big part of it. I used to be a complete FX head and pretty much worked out all korn's effect sounds to play as covers. my pedal board was about 1 and a half meters long and running it was like doing an Irish jig. i sold alot of it to buy other things but im started to re-aquire most of what i sold.
Any way, try that out and see what u get. I used a 5150II Head, Marshall 4X12 with Celestian G12 75T speakers and an ibanez RG7620 with custom wiring, so how close your sound would be to mine is quite hit and miss but it can be done
