Actually, I refuse to reamp unless I have multiple DIs flowing through the amp at once. And if I only have one DI, I simultaneously play arbitrary notes through the DI on my interface while reamping just to get that dual-DI tone.
What everyone else have said.. it's a bad idea..
What you can do.. is run the 2 different guitartracks through the same IR.. with the exact same result as running two tracks with the same IR on each one..
Not copy/paste 4 times, only once. And "reamped" from my computers Headphone Out through 5150 and Mark IV......I think with a shitty Radio Shack mic....and no interface.......Back into my computers Line In....... Back when I first started out.....
I've ran 2 DI's through a cab at the same time. It just sounded like one track played sloppy with more signal hitting the amp's input, so it was overdriving easier.
No, I've never tried that. But it's a surprisingly commonly asked question.
Even when I first got a shitty fostex 4 track over a decade ago I realised that playing something twice made it sound heavier, as the human imperfection is what give it that fatness.
Even when I moved onto protools I never once tried to copy and paste a guitar track to 'double it', as it just doesn't make sense to do so.
Actually, I refuse to reamp unless I have multiple DIs flowing through the amp at once. And if I only have one DI, I simultaneously play arbitrary notes through the DI on my interface while reamping just to get that dual-DI tone.