I'm a mix engineer/producer and I've been roped into "mastering" a compilation for a band I was once involved in. Yep, there's no money. The CD will contain about 20 tracks, recorded across the period 1979 - 1985. Some were mastered at Sterling, some at Townhouse in London, some at smaller (but OK) facilities.
Needless to say, there's a big difference in the sound across the various sources, and there's also a big difference between what this material sounds like and contemporary tracks.
So ... should I leave well enough alone and try and just match up levels, or should I try and match up the tracks to sound at least somewhat similar .. further to that, should I try and get the levels up a bit more to contemporary levels??
Any input appreciated.