I said that "Custom" exports from Avid, or "Custom" exports from QT Pro will screw up the resulting file. The key word here is Custom. In other words, in Avid, hitting the button that says "Custom" in the export dialog is a big mistake. And in QT Pro, hitting the button that says "Export" (CMD-E) is not a good idea.
Here's the thing. On this system I have not had a level problem exporting a multitrack QT ref from Avid and then using QT Pro to make a self contained ProResHQ .mov that will then ama link back to my Avid and display proper levels. This has been an efficient way to get multitrack audio out to a file for me without having to recombine things outside of Avid. I did have that issue with a mixture of DNX 220 and DNX 220X mentioned in a previous thread. Forcing my render to DNX220 and unchecking same as source solved that issue. A video mixdown would have worked as you had suggested at the time but to save drive space and facilitate last minute changes I opted not to do a mix down. That worked in my particular workflow but I had time to check out the whole food chain.
When I export my QT ref from Avid I set it to 601/709 levels, which is what the Avid is using internally. I might speculate that the person who created the file with improper levels might have exported a QT ref set to RGB. As a QT ref it is using existing media from the Avid which is by Avid nature 16-235. Flagging the QT ref as RGB wouldn't change the levels on the Avid media files it's referencing as far as I know. Seems like 16-235 got wrapped with a flag saying it was RGB. This would explain why the levels come in low if in fact the ama link to file interprets things based on these flags.
Like I said I've had good luck with my QT Pro self contained exports from Avid QT ref files. What would you use to marry multichannel audio with video for file delivery? I'm on SNDX mac 5.5.4.
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