That's what I'm talking about. In the instances I mentioned you have one side with relatively low gain and a mid-heavy tone to give you the note, the other has ridiculous gain and is heavily scooped and is there to sound evil.
Hmm... wouldn't say that it's old school. Slipknot, Korn, Chevelle, Underoath, Evanescence.... many modern bands still use it and when done correctly it gives miraculous space in the stereo image of a crowded mix.
I agree that there are plenty of instances of modern bands who use two tones, but in these examples it's usually because you have a band with two rhythm guitarists, who use their own set ups. In the case of Slipknot or Underoath both guitarists are using similar gain and tone types. However I can't say I'd want to make an IR from either
or
no matter how much I dig the songs