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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