Read all your feedback and I have to say I agree with a few of you.
First of all, I don't believe it was shot at a soundcheck. We all know Rush were capable of performing this sort of thing live, so they would gain nothing from recording a soundcheck. Also, I've heard bootleg tapes from the Moving Pictures tour, recorded from audience mics and they can cut it, theres no question.
You raise a good point about cost, but theres a bit of evidence that leads me to believe it was all filmed. In the intro, when the Camera Eye is playing over footage of them setting up, it shows a shot of Alex doing a sort of Pete Townshend windmill on his guitar, footage that doesnt appear in the concert. Also, for the end credits, theres shots of Geddy jumping up in the air that doesnt appear anywhere else. (yeah i've watched it a lot ) It shows the cameras must have been there the whole time...
I hope it will surface someday. I would also agree, would love to see the full GUP and ASOH concerts restored too. Just cant help but think that the hopes of seeing those are gone since nothing was added in the Replayx3 releases. Who knows?