Take a classic vintage overdrive and deck it out with a myriad of options that are all highly useful to any guitarist. This is what Kirk Hammett, David Karon and engineer Antonin Salva have come up with and the results are great. You can use the KHDK Ghoul Screamer as a clean boost, midrange boost or overdrive, full-range boost or overdrive, all with three distinctly different levels of compression/clipping. There's not a bad sound to be had among the countless permutations and it works beautifully with any guitar and any amp. Such is the versatility of the Ghoul Screamer.