> An acciacatura differs from a rolled chord in that it contains anadditional, dissonant note that unlike the chord itself is not sustained beyond the completion of the roll. (Technically, the acciacatura consists only of the dissonant note itself, not the chord into which it is introduced.)
But the slash does not exclusively indicate anything but the rolled chord. The added dissonance is not implied by that symbol itself, but by the context.
Well, like everything else in Bq. notation, this varied among different composers, times, places, but in, for example, the WTC, a slashed chord means an acciacatura, while a plain rolled chord is indicated w. a vertical wavy line, as today. Similarly in Couperin, for example.
-- Andrew Stiller Kallisti Music Press
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