Apologies if my following points have already been made by others. I
only occasionally look at digest versions of this list.

Tom Fine writes:

> I've run into the same thing with Dolby A reels, with azimuth aligned with a scope, the level-set
> tones are sometimes lower than expected and in those cases it's great to have Dolby tones to get > the CAT22 to track well on decode. I've always ascribed this to self-erasure over time.

I think you are mistaken. There have always been differing standards
for what constitutes Dolby level. It is hardly uncommon to see Dolby A
encoded tapes recorded at different fluxivities.

Regarding describing azimuth as being aligned with a scope, this is
always somewhat ambiguous unless you also state whether you mean that
two tracks were aligned for minimum inter-channel phase difference, or
that one (or both) of those tracks were aligned for peak short
wavelength amplitude response.

Fred Thal
Audio Transfer Laboratory