BTW, what does all this have to do with my original request for a
little software program :)
But wasn't Beethoven writing long after Bach had figured out the
tempered piano tuning? Besides, assuming that Beethoven was playing a
keyed instrument ... well, unless he had some extra keys ...
Yes, you are right that equal temperament is less that perfect ... but
on keyed instruments (and this will include fretted stuff as well) one
doesn't have much choice when playing.