Topmusicanswers
The entire song is played with a wah, a very, very detuned guitar, and probably a dimed out or nearly dimed out Mesa Triple Rectifier. The hollow effect that you hear is either from an envelope filter or the combination of the wah riff along with a phase effect, and likely a small stone chorus as well.
What effects do Korn use?
Used in a bunch of the their tracks, its octave-down effect can be heard most prominently in “Here To Stay”; arguably Korn's heaviest song. Modulation is another key ingredient of the Korn sound, with Munky and Head using chorus, flanger, phaser and univibe pedals to attain creepy and unsettling sounds.
How did Korn come up with their sound?
“We were trying to sound like a DJ had remixed our guitars, y'know, and cutting them up and scratching,” guitarist James “Munky” Shaffer told Rolling Stone. “That's kind of how that sound was born.”
What makes Korn unique?
We always wrote songs as a five-piece band and made unique accents and breaks specifically to the vocals. "Well, there goes that unique KORN sound. ... "I made several attempts to get the band to get back to the basics and write and record like we did the first three records, but was met with opposition every time.
