Thanks for the clarification, Rod. The extent of the speed change
throughout a pack is variable, but it is apparently noticeable to some--to
the point where beginnings and ends of a tape could not be spliced together
in some projects. I never saw this even on consumer ReVox A77 machines. I
now have all constant-tension machines and in my tape restoration work I
haven't actually come across a problem of any significance in this regard.