Ive got a question about headroom/levels. Lets say I track at around -16db(with the tracks volume turned down to these levels). After tracking I have all the proportions set between the instruments, EQ done and all that and I have the mix sitting still at about -16db. Now in order to prepare it for mastering I should get the mix to the -6 db levels. Is it OK to group all the tracks and using a single fader just raise the whole thing to -6db or should I raise each individual track just to reach that level ? The thing is: I think that Im messing up the levels at certain points during the project and I guess it kills the headroom. And then clipping occurs and other nasty stuff.