Hi Bernard,
Back then there were quiet more then a few who heard distortion on a large part of the tunes before the intermission.
The culprit is, not all systems could play all the sound options on the DVD's Blu-ray.
Most folks with systems with all the surround options, the ones they switched between the sound-modules could hear on some of the modules a distortion on Hanks signal during the hole first half, some tunes more and some less...
On the top of my head, it's years ago I listen(yes indeed because of the sound before the pause).
One of the options is much worse then others and their is one, on which Kon Tiki is the worst and the rest much lesser then on the other modules.
Some bass mixes are also very different between sound modules.
It's nice you bring Brian's first reaction on this matter....in a later stage(when peeps including Warren demoed the distortion) Brian reaction was different.
A year later when I mentioned to Hank in Brian dressing room(Amsterdam), he told me they were unhappy surprised during the intermission(and that is visible on their faces when they re-enter the stage.
Also it was discussed on a serious level not to published the DVD etc....but commitments were on paper and involving a lot of money.
So I have it from 3 of the horses mouth so to speak....stupid me I forgot to ask Bruce that day...
It's indeed long ago and lets go on with other musical adventures
Cheers Rob