[JFreak]

While not necessarily good idea for a final mix, I do this a lot when I track a live gig from split and do a rough mix while soundcheck is on. That would not be otherwise necessary but doing a rough mix without plugins makes you realise if some mic positions need to be adjusted. While touching the subject, at those gigs I also rely on the holy trinity of LCR -- meaning all tracks are panned hard l/r or dead center.