One of the most important skills as a supervising sound editor is to be able to decide whether a fix can be done then & there (ie very rapidly without holding up progress) or it should be done off the stage & revisited later (in ten minutes, an hour, a day etc)
For adding fixes during the mix the two crucial aspects for me are:
- naming convention
- colour coding whether a fix has been mixed in
On VFX heavy films sound editors are constantly working at the same time as the final mix, so you need to have a good naming convention that everyone uses so that you are clear about what version a fix is & who it is from... I also request the timecode to be included in the file name. I never want to have to import whole tracks (Import session data) as that means taking a Protools offline from the mix. And I also do not want to spot to timestamp because if the tracks are full I do not want to spot it on top of existing material. So with a properly named file I can bring it into any of the live PT sessions, place it roughly in sync, verify there is space for it & then nudge it into place, all without stopping playback.
Adding new material to a live session must be done very carefully - you can't go adding new material to a reel without knowing it has been mixed in, or that new material could be accidentally screened to the director etc unmixed. So I use colour coding - everything exisiting is one colour, anything new is bright red until its mixed. I also try to drop markers on every fix until its mixed in, so if its a case of having ten minutes free to zip back & mix in fixes, I can jump to markers & tell the mixer where to locate...
I always have a laptop PT system on the stage with drives with all material from the mix on them, so I can dive in & cut a fix myself offline.... I also have netwrok access to ym whole library.... The laptop is also handy when getting mix notes, for quickly referring to TC points...
I'll cut stems if a fix or replacement is required on the PT playback dubber but never destructively... I also keep all predub source material on hidden tracks on the live PT sessions incase that material needs to be revisited and/or borrowed for other fixes..