Best Multi-track editor?
I think that depends on how you like to work and what "best" means. Live 6 is *very* good and I found it pretty intuitive. I don't use much in the way of plug-ins, etc. so I can't speak to that side of it. If you're more of a "roll your own" kind of person, Ardour is pretty interesting and offers a whole lot of functionality for $0 (it's open-source). It's currently in version 2 beta, and, like a lot of open source projects, the documentation lags behind the coding. Because of that, the learning curve can be steep as you kind of have to figure out a lot of things yourself. Can't beat the price, though. 🙂