Re: My HI-Gain pedal search is still ongoing - Megalith Delta.
What rig are you putting in front of it and what guitars and pups and strings are you using?
In my experience an overdrive thickens and makes what you already have sound larger. The amp/amps have to be a studs; Randall, Mesa, Bogner, VHT etc... To shape the final tone you're going to have to perfectly dial in your gear down to the details to nail it.
The Pantera/White Zombie sound is pretty straight forward. The pedals change a little from band to band but the backbone of the sound is a hot bridge pickup and a vintage neck pup through an overdrive. I know J. from WZ used a JB/59 combo for a lot of his recording and some live guitars, and he was boosting through an Ibanez TS9 tube screamer, some fuzz and a wah, then split into a MB triple rec AND a Randall Century 200. His live rig is the same one Dimebag was using circa 1996-1998. The problem is you won't get the correct tone out of this rig unless you're running them up pretty good on volume. I've done this in my house and the tone is perfect but I rattled half a set dinner of plates onto the floor out of my cabinets (not joking). You also shouldn't be using what most metalheads run for string guage. Get a set of 9's, let them them get about half crusty and max out the treble on the guitar, fine tune treble with the amp. The smaller, dirtier set sounds like a bigger clean set this way until the notes get up high enough then they break over harder into highs that 11's or 12's won't. Noise gate the whole thing to your satisfaction and this will get you pretty close.
