Johann from Amon Amarth drinks whiskey and eats potato chips when tracking vox. Not saying he's the same type of singer as Jorn or Marco but different people do different shit. My singer idolizes Jorn and can do that raspy yet melodic thing, his only trick is to snort water through his nostrils (which induces dry heaves in me every time I see it). Oh and about a pack of Parliaments for each session... the boy loves him some smokes
Honestly though keep in mind that both Jorn and Marco are like in their 40s I think. I would say that a large contributor to the current sound of their voices has to do with abusing those same voices for a lotta years. Same with Hansi from Blind Guardian. Of course there are things you could do to mimic it. Just sing something you would normally sing and just get yourself into a super pissed off / evil headspace. Use a little more throat instead of diaphragm ... and don't forget to cup the balls
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