beat 1: the rhythm should be as usual, that is, two demisemiquavers
followed by two semiquavers.
31468 the motif is consistently rewritten as a dotted crotchet and four demisemiquavers
, except in one place (bar 39, counting bars in semibreves) where the copyist evidently overlooked it.
The early version of the first section (which readers will also find in the Neue Bach-Ausgabe IV/vii at page 154) omits virtually all the demisemiquavers
which fill out the scalic passages, and it also has a firm tonic cadence and reprise of the opening, though an octave lower, at bar 15: thus the shape of this section is quite different from that of the familiar text.
To take an obvious example from Cosyn: it is clear that he abandoned his old-fashioned habit of flagging quavers and semiquavers separately and reserving beaming for demisemiquavers
only towards the end of his work on CVB.
Thus the appearance of demisemiquavers
in a published source would imply that the tempo for a minim was significantly less than MM 60.
1 suggests that Couperin was not the only 18th-century admirer of Corelli who equated poetic frenzy with demisemiquavers
Corelli's bass is left unchanged throughout, although in the first two variations its note values are doubled, apparently to avoid demisemiquavers
in the violin part (and presumably with [symbol omitted] intended).
The effect of the tremolo is the same as that produced by a succession of demisemiquavers
on the same pitch in a fast movement.
If both movements are andante and later on use demisemiquavers
for much the same decoration, they cannot differ much in character.