Oh, by the way, us older geezers used to cassette recorders remember playback speeds in the range of +/-10%(?), depending on the quality of the equipment, battery power and some manufacturers who thought they could achieve something by speeding up a little … 
No matter how you look at it, cassette recorders where not an exact science! Remember how those “time”/feet/lap counters never matched up with other brands or sometimes not even with themselves!!!
The pitch was kind of tied to the playback speed, no matter what, sooo … maybe that explains what’s wrong with us?
Those were the days 
432/440=0.981 so it’s kind of close after all?